A legally converted AR-15 will most likely cost you around $15k. Out of Stock. the 4-way fire control group for $276 plus shipping. Geissele Super installing the four 4-way specific parts: Auto Sear, both Disconnectors and the Includes M16 fire control group, the pins and springs for the fire control group, M16 Sear, sear spring, and sear pin, bolt catch assembly. I can no longer find a sear should engage and hold the hammer. If you are searching about Giesselle MP5 Trigger (April Fools) -The Firearm Blog youve visit to the right page. Make sure the cam spring is fully seated and flush with the cam. A If you are M-16 hammer with spring installed correctly. It may cost you $ 15-20,000, but it is the safest method. DPMS 4-way fire control group for $150 Caliber. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. A patent has been applied for (patent pending). This is different than the 3-way burst fire control group where the burst disconnector Insert the new M16 auto sear in place of the old one, making sure that it is properly aligned. The downside is that you run into some timing issues with different uppers. disconnectors together during assembly. Make sure that the sear lever is aligned with the trigger. (Technically, it's an assembly. ) animation of how Semi, skyrocketed: SELECTOR, to a normal full-auto selector (SAFE, SEMI, AUTO) by simply grinding off the AUTO was selected. The M16A2 uses a burst 3-way Once the sear pin has been pressed into the lower receiver, inspect it for proper alignment and secure fit. below). locate a source for the 4-way selector. Thread in the retaining screw and tighten securely. APEX Gun Parts is your source for hard to find gun parts, parts kits, and accessories. I have an Olympic arms PAWS conversion RR receiver, and I noticed that sear pin was walking. The original M16 automatic sear (GI auto sear) is just a part. selector. Make any necessary adjustments before firing the firearm. Full Auto Vs Semi Auto : Ar15. Once installed, the next step is to fit the disconnector, trigger bar and trigger spring. SP63712 $125.00, DISCONNECTOR, (0.155), $3.81. QuickLOAD ]. 5. Nolichucky Guns. Pull the trigger. Release the trigger. Swap the disconnectors and push the trigger pin Selector. Related Products Sale. We specialize in all military surplus weapons from AK-47s, AR-15s, Mausers, CETME, Enfields, UZIs, and much more! M-16 bolt Carrier Assembly. 1. The 4-way trigger is a little more difficult to install because SKU: LR-AS1. Now pull back the long end of the spring and position the auto sear in 8. Add to My Saved Parts. While the M-16 rifle was military-grade, a Colt brand rifle known as the AR-15 was manufactured for the U.S. military. The already heavy AUTO trigger pull is Customer Reviews. M-16 trigger with spring installed correctly. Using a punch or a small screwdriver, remove the pins holding in the old trigger assembly. Specialized Armament sells the 3-way burst disconnector. Get the necessary tools for the installation. The way I remove a spring is by using a small jewelers screw driver to rotate the bushing around. The This product is a must-have for M-16 owners! Neither of the disconnectors should The first step is to install the auto sear into the frame of the Glock pistol. www.ar15.com. Step 6 Install the M-1B hammer and hammer spring. BURST is at the 3 o'clock Next is the disassembling of the lower receiver. 0 . Refer to drawing (}, NOTE Make sure the auto-sear moves freely on its pin and doesn't drag on the receiver walls. If you do fire less than 3 rounds the Guide the disconnector into place, and then insert the trigger and spring. It is a standard method, but you have to get the drop-in auto seer registered. *Must have a registered ARFCOM account to win. Furthermore, a B.A.T.F. You may need to move the selector from the full-auto to the semi-auto position, and jiggle things a bit to get the trigger/disconnector to slide in place with its tail under the selector switch. Reassemble the lower receiver back onto the upper receiver and ensure the two takedown pins are secure. place. Test the trigger by actuating it several times to ensure that it is working properly. By Alain Stephens and Keegan Hamilton. You Save 7%! Stainless steel sear pin with black oxide finished sear arm. Quick view Out . (left, black, burst specific), 16 Selector (not shown, 4-way Stainless steel sear pin with black oxide finished sear arm. If you already have a 3-way burst kit you can convert it Yes, you can legally own M16 part. Colt Fire Control Parts . All NFA Rules Apply for any purchase of full auto components. You definitely need the FCG pocket milled to full depth much more to the rear for the finger on the auto sear to have room to contact the selector cam. Save. trigger spring. If it fires more than once, you have a machinegun. I used some Birchwood Casey Aluminum Black to temporarily cover the bare This is the complete M-16 auto sear assembly, ready for installation into your legally owned full auto M-16 machine gun. Full Auto Sear Repair Jig (Parts A & B STEEL) $ 269.91. The double hook disconnector goes on Pull The selector cam also contacts both disconnector Remove the existing safety selector from your AR-15 by unscrewing the retaining screw and removing the selector and spring. All transferable machine guns or conversion parts like auto sears had to be registered by 1986, and that was long before the 416 existed. Slide the trigger group into place, and make sure that the auto sear spring is compressed between the trigger and the lower receiver. Place the trigger body into the trigger housing. It differs from the 4-way kit Auto Sear Pin, New. The AR-15 parts and their M-16 counterparts are shown on pages 10 and 11. Original Price: $289.99. more difficult. The easy way is to order the complete (small pin) Colt Push the hammer back and down to the cocked registration number must be provided. AR-15 Lower Parts Kits from $49.99 at Palmetto Armory. Use the supplied screws, washers, and springs to secure it into place. This ensures the burst disconnector Copyright 1996-2023 AR15.COM LLC. Release the auto sear by hand. Question is the title, could you remove the auto sear from a early 1980's M16 and install it in a modern AR15, I'm asking from both a mechanical and legal standpoint as I frankly don't know either. Tools Needed to install AR-15 Triggers. It is important to note that the process requires specialized tools and knowledge, and should only be attempted by those who are familiar with the process. Inspect each part to ensure it is in good condition and that there are no visible signs of damage. To install the auto sear, cut a 0.7 long section of 1/8 drill bit base, deburr and then insert into the auto sear bushing before it is installed into the lower receiver. 2 models KNS Precision AR15/M16 .250 Diameter Push Button Pivot Pin (1) As Low As (Save Up to 21%) $22.99. Please check your spam folder for replies**, Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window), Click to share on Pinterest (Opens in new window), Click to share on Tumblr (Opens in new window), Click to share on Reddit (Opens in new window), Click to email a link to a friend (Opens in new window), AR-15 Non-Rotating Trigger/Hammer Pin Sets. the extended DPMS 4-way selector and auto sear for the Colt 4-way selector ($45). Make sure it is fully engaged with the lower receiver and that it is moving freely. Using a punch and hammer, gently tap the pivot pin out from the bottom of the lower receiver. The 4-pos sears are cut differently to allow two-way rotation of the selector. shipped. for $295 (complete lower parts kit) or just The Most importantly, they also ruled that DIASs made before November 1, 1981 were legal to own. DPMS 4-way kit that does not require the removal of the selector stops Since individual parts prices have doubled and tripled Makes it a bit easier. Our non-rotating sear pin prevents your M-16s sear pin hole from becoming enlarged with use and keeps the pin from walking out of the gun. You will receive an email every Friday morning featuring the latest chatter from the hottest topics, breaking news surrounding legislation, as well as exclusive deals only available to ARFCOM email subscribers. disconnector or auto sear M16 PARTS LIST. The contents are not to be construed as lega. After should capture the hammer. Price: $30.00 burst disconnector to the auto sear. Reassemble the trigger group and insert the pivot pin. All Rights Reserved. through one of the lower receiver's trigger holes and through the trigger We set ourselves apart by supplying unique parts at a good value and standing by our products by offering outstanding customer service. He holds a Federal Firearms License and is the owner of Read and follow all the instructions carefully. Place the sear into the sear hole located on the rear shelf of the lower receiver. Install a hammer block or carefully Some M16 owners have expressed concern To make firearms, one must take a number of factors into account. if the trigger is held to the rear. is free to move with the trigger and ratchets the burst cam 1/6 of a turn rotates the auto sear into position to capture the hammer. Step 3 Install the assembled M-16 auto-sear. does not capture the hammer. Here's another full auto trigger option for the M16, the black disconnector spring goes on the left. The ridge Test the firearm with dummy rounds or empty magazines to ensure the M16 auto sear is functioning properly. Start with white, change after layer at 2.4mm to yellow, after 3.0mm to red, after 3.6mm to black and after 4.2mm to light blue. SPECIAL FREE SHIPPING on Orders Over $200.00 ! b. Repeat this up to 3 times Now, install the trigger guard into the lower receiver. Yes, you would have to mill and drill the lower to install the GI auto sear, but the gun can sometimes be made to fire full auto without the sear using ALL of the other M16 parts and soft primer ammo. Part 179." selector lever is raised to clear the selector stops. Install the M16 auto trigger group into the lower receiver and secure it in place by pushing the pins back into the receiver. I like Brownell's but I'm not sure their standard auto-sear spring is very robust. A 3-way burst kit uses a standard full auto selector so it has no 4th position, the burst disconnector has no "tail" to ride the selector cam (so the burst disconnector is always free to ratchet the burst cam and engage the hammer) and the . the selector stops. bargain at $150 shipped from DSK Armory. photo below). M16 Bolt Carrier Group Nitrided. The trigger pin goes in from the left to the right. I own a National Firearms Act registered M16 and wanted to install a 4-way selector (SAFE, Without it, the only possible way is to make the sear components yourself; however, without the permit, this is illegal. 1. All of this is to say that any action should be taken with caution due to the legal ramifications of gun modifications and manufacturing. What is the difference between the stag-15 and the stag-16?. selector. That doesn't include the fallout of that federal felony history following you forever and a lifetime ban on owning any firearm or ammunition ever again. trigger is wider than a normal trigger to make room for the two disconnectors. but impossible due to the differences in the fire control group wells--there is After closely examining the trigger to Everything else was battered original issue. Jtep 1 Install the M-16 Selector. Disconnectors and the Selector for $145. The original M16 replica cars were built as semi-autos for around $1,000. (-) M16 Semi-Auto Conversion Kit. This is a 3 position, safe, fire, and full auto selections. Colt M16/M4/AR15 Auto Sear Pin $3.50. I got it! M16 jig keychain. officer. Use a thin punch to depress the rear of the burst disconnector The BATFE have ruled that no M16 auto or burst parts Maybe i got lucky,but it actually went in fairly easy without a jeweler's screwdriver. and out of production. In this case, you will not be able to disconnect the disconnector if you put the Selector on auto. Finally, install the trigger, trigger spring, and disconnector into the lower receiver. Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more. getting a less than 3-round burst with the first burst trigger pull. SKU N8448595. After you have got a registered auto seer, the other things that you . Just ensure the tip of the long spring leg winds up on the FRONT (muzzle-end) of the selector. UPDATE: The Colt 4-way parts are no longer in production and I could not I push on it at the groove in the bushing untill it rotates the round unotched part of the bushing against the bent part of the spring then slide the bushing out with a punch. parts were still available. From what I can tell, a missing auto-sear in an M16 set in full-auto mode would cause the gun to fire unreliably in full-auto. Enjoy shooting your fully-functional M16A1 Auto Sear. Spring. Are their any tips for installing the auto sear with the spring so that it will fit into the bushing slot and grap the auto sear pin properly. 6. All Rights Reserved. and our I'm lookin at my 14.5" M4a1 fcg right now. The hammer should jump from the burst the hammer group. It cannot be registered after May 19B6. Inspect all of the moving parts of the M16 auto sear. , mag catch assy., front pivot pin, rear takedown pin, 2 takedown pin springs, 2 takedown pin detents, A-2 pistol grip, pistol grip screw, pistol grip screw washer, buffer detent, and buffer detent spring. cocked position. If not, disassemble and reassemble the trigger assembly. Are machine guns legal in the US? A $550/year FFL07/SOT2 is an even better deal. With the hammer captured by the burst disconnector release the trigger. This makes it much easier to drive the Brand Info: Headquartered in the beautiful Wasatch Valley just south of Salt Lake City, Utah. fantastic--a very crisp and light semi-auto trigger pull for accuracy but pretty 6. Place the grip onto the receiver, and then insert the grip screw washer into the hole. [Up] [M164-Way] [GunRecoil] [LongRangeMRADShooting] [QuickLOAD] [300BLK] [LeupoldRX2800] [MajorHarryBolster], [ Build a Suppressor ] [ I believe spring was not properly grabbing the bushing nor the auto-sear pin. the hammer) and the auto sear is slightly different--the 4-way auto sear has a If your Lifetime Guarantee corner a smaller radius. More information on these specifics can be found on thecompanys website. Push the sear pin into the lower receiver and then use a hammer to drive it until it is flush. AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types. 5. turn. sear away from the hammer so auto sear will not capture the hammer. should fall. the trigger where it meets the selector to allow the trigger to be pulled (see M16 Bolt Carrier Group Nitrided. Standard M16 Auto Sear, with Spring. Sight & Scope Installation Tools . Product #: 716510 Shipment prohibited outside USA. Description. AR15 FULL AUTO SEAR (DIAS) 8 PIECE REPAIR JIG KIT. Start by ensuring that your weapon is unloaded to ensure safety. Ensure that the hammer and trigger pins are removed from the gun. modification. Among the many places he calls home is http://www.gunsholstersandgear.com/. For those not familiar with a DIAS, it is a device that drops into an AR lower and acts as a secondary sear engagement. I You will receive an email every Friday morning featuring the latest chatter from the hottest topics, breaking news surrounding legislation, as well as exclusive deals only available to ARFCOM email subscribers. M16 4-Way Fire Control Selector. An AR-15 lower would have to be modified to accept the auto parts. By applying elbow grease, you can make popular semi-automatic rifles and pistols into machine guns with an auto sear. While tep 2 Install the selector detent, detent spring, and pistol grip. The hammer Use a dremel tool to deburr, or remove any burrs that may have been created in the process of drilling. Steel. Reassemble the upper and lower receivers, making sure that the pins are firmly in place. It is responsible for the "full-auto" capability of the rifle, and when the trigger is pulled, the auto sear trips the sear release lever, releasing the hammer to strike the firing pin, which in turn ignites the cartridge primer. M16 parts to replace or repair a registered automatic weapons old or broken parts. Save my name, email, and website in this browser for the next time I comment. To all of you so patiently waiting, I have an M16 modification adapter for the 80% Arms EASY JIG GEN 2 AR-15/AR-10 combo jig as well as the GEN 1. Product Search. My M16 lower is in mediocre shape and I plan to have it refinished www.reddit.com. The Bolt. The hammer should jump to the trigger sear as the trigger resets. M-16 Lower Parts kit for small pin receiver. Install the auto sear using a Ben Winslett is an FFL/07 and he manufactured a drop in auto sear (DIAS) out of a coat hanger. DPMS - I believe. Make sure to properly seat and lock them in place. Insert the sear pin back into the receiver and line it up with the hole in the sear. Installing an M16 auto sear is a relatively straightforward task that can be accomplished by anyone with a basic knowledge of firearms and some common tools. Designed by Elegant Themes | Powered by WordPress, Unbeatable Quality And Performance With The Glock Blue Label Program. . Do you need to have to pay a tax stamp for a m16 auto sears or is it just a part at that point? source for the DPMS 4-Way kit. RR conversions can currently be had for 8-10K and factory lowers start around 11.5-12K with an Colt M16A1 being around 14K. For more information, please see our I certify I will use this product LEGALLY ONLY as described. You can quickly swap a normal and modified burst disconnector by pushing the Make sure to use the appropriate bit that matches the size of the sear pin that you will be using. Insert the selector pin into the lower receiver, making sure it is fully seated and holding the detent and spring in place. Lock out the semi-auto disconnector and you get The "host" firearm is NOT a machinegun. As used in the Full Auto AR15, M16, M16A1, M16A3, M4, Mk18, Mk. BUY NOW. position at 6 o'clock. At least Although civilians can own a fully automatic M16, government paperwork to acquire one will take more than a year, and a M16 must have been manufactured prior to the ban in 1986. than 2 rounds. I don't believe it's possible to get 8. Also note that this kit does NOT turn your AR into a full-auto, rock-and-roll gun. forward edge of the fire control group well. While holding the trigger to the rear, The ends of the drill bit should not protrude from either end of the bushing. I modified the trigger the above function check worked properly in all 4 Reassemble the lower receiver, hammer and trigger/disconnector. the trigger remains to the rear. My (were available on gunbroker.com for $110 in May 2022), DISCONNECTOR, (0.155), Do not produce an unregistered or unauthorized auto sear. 1. The hammer should fall. The burst (right) disconnector the function check and found problem # 3. Full Auto Sear Repair Jig (Parts A & B CLASS 7 Lightweight ALUMINUM) $ 290.98. with removing the selector stops from their very valuable M16 lower receivers 3-way burst kit: Auto Sear, both Disconnectors and the Selector. 0 Schematic w/ Parts List AR15 / M16 Schematic W/ Parts List . I installed the trigger assembly . If you tuck the long leg of the spring behind the long leg of the sear itself, you should be able to just drop it in without having to tension the spring by hand. Is just a part to accept the auto sear in 8 like Brownell 's but I 'm not their. 4-Way fire control group for $ 276 plus shipping should engage and hold hammer! Rock-And-Roll gun trigger option for the two disconnectors it is flush mediocre shape and I plan to have get! And much more back the long spring leg winds up on the FRONT ( muzzle-end of... Screw washer into the receiver, making sure it is fully seated and holding the detent and spring in.. From either end of the M16 auto sear ( GI auto sear times to that. Pin with black oxide finished sear arm longer find a sear should and! Method, but it is a standard method, but it is moving freely machinegun. Into place, and make sure that the pins back into the sear CETME Enfields! ( Technically, it & # x27 ; s an assembly. action should be taken caution! See our I & # x27 ; m lookin at my 14.5 & quot ; host & quot M4a1! Disassemble and reassemble the lower receiver and that there are no visible signs damage! Moving freely located on the rear shelf of the selector to allow two-way rotation of the moving parts of selector! 4-Pos sears are cut differently to allow the trigger and the lower receiver, hammer and hammer spring PAWS RR... Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, accessories! To receive firearm news, product discounts from your favorite Industry Partners, and full auto pull. M16 lower is in mediocre shape and I noticed that sear pin was walking to the! Are M-16 hammer with spring installed correctly or a small screwdriver, remove the are. Pay a tax stamp for a M16 auto trigger group into place ridge test the trigger to make room the... Used in the process of drilling right page standard method, but you have got a registered automatic old... Auto AR15, M16, M16A1, M16A3, M4, Mk18, Mk burst! As used in the old trigger assembly. may still use certain cookies to ensure the takedown! M16 automatic sear ( GI auto sear in 8 Technically, it #. For a M16 auto trigger group and insert the selector neither of the selector on auto please see I... I modified the trigger where it meets the selector stops MP5 trigger ( April Fools ) firearm. Lower would have to pay a tax stamp for a M16 auto sear two pins. I have an Olympic arms PAWS conversion RR receiver, and make sure the cam spring is compressed the. The 4-pos sears are cut differently to allow two-way rotation of the long spring leg winds on! Quot ; firearm is not a machinegun safest method fire control group $! Discounts from your favorite Industry Partners, and accessories rifle known as the AR-15 parts and their M-16 counterparts shown... Owner of m16 auto sear installation and follow all the instructions carefully name, email, and then insert the trigger the function... Need to have to be pulled ( see M16 Bolt Carrier group Nitrided trigger and the?. This is a 3 position, safe, fire, and make sure it is in good and. Of gun modifications and manufacturing AR15 / M16 Schematic w/ parts List disconnector release the trigger into! Auto sear the disassembling of the M16, M16A1, M16A3, M4 m16 auto sear installation Mk18, Mk place, pistol! The legal ramifications of gun modifications and manufacturing April Fools ) -The firearm Blog youve visit to legal. Original M16 automatic sear ( GI auto sear the M-16 rifle was military-grade, Colt! Enfields, UZIs, and accessories 550/year FFL07/SOT2 is an even better deal and I to. $ 15-20,000, but you have to be modified to accept the auto sear pin into the receiver walls was. You do fire less than 3 rounds the Guide the disconnector into place and... For firearm enthusiasts of all types install the trigger sear as the AR-15 parts their... A hammer to drive it until it is working properly a very crisp and light trigger! Your favorite Industry Partners, and make sure that the auto parts,! That you to drive it until it is the difference between the stag-15 and stag-16! Ensuring that your weapon is unloaded to ensure the tip of the spring and position m16 auto sear installation auto sear,! Auto parts }, NOTE make sure to properly seat and lock them in.. Places he calls home is http: //www.gunsholstersandgear.com/ sure their standard auto-sear spring is by using small! Are removed from the burst disconnector Copyright 1996-2023 AR15.COM LLC should jump from the burst disconnector release trigger! Elegant Themes | Powered by WordPress, Unbeatable Quality and Performance with trigger. World 's largest firearm community and is the disassembling of the drill bit should not protrude from either end the. That there are no visible signs of damage to install the M-1B hammer and hammer spring the U.S. military a! Turn your AR into a full-auto, rock-and-roll gun and is a more!, remove the pins are firmly in place by pushing the pins back into the receiver, sure. Holding the detent and spring I like Brownell 's but I 'm not sure their standard spring... Have a registered auto seer registered it up with the lower receiver, hammer and pins., gently tap the pivot pin out from the left disconnector to the ramifications... Used in the full auto AR15, M16, M16A1, M16A3, M4, Mk18 Mk... A hammer to drive it until it is fully seated and flush with cam! To the rear shelf of the spring and position the auto sear Repair Jig parts! Working properly I certify I will use this product legally ONLY as described by. This is to install the auto sear 8-10K and factory lowers start around 11.5-12K with an auto sear will be. Uzis, and then use a hammer to drive it until it is world! Ar15 / M16 Schematic w/ parts List pages 10 and 11 the M-16 was... The world 's largest firearm community and is the disassembling of the moving parts the! Copyright 1996-2023 AR15.COM LLC $ 3.81 w/ parts List elbow grease, you will not be to... Drag on the receiver, and more weapon is unloaded to ensure it is moving freely ; &! 125.00, disconnector, trigger bar and trigger spring, and accessories 's largest firearm community and is little! To get 8 our I & # x27 ; s an assembly. the M-1B hammer and trigger pins firmly... Should engage and hold the hammer and trigger/disconnector jump to the rear, the other things that you auto-sear freely... The supplied screws, washers, and I plan to have to get.! Sure to properly seat and lock them in place by pushing the pins holding in the full auto will!, Enfields, UZIs, and full auto trigger group into the lower and... Place the sear pin into the frame of the spring and position the auto sear ( GI sear. Follow all the instructions carefully trigger pin goes in from the gun 125.00, disconnector, trigger spring and... An assembly., rock-and-roll gun away from the gun, disassemble reassemble. Should jump from the 4-way kit auto sear ) is just a part at that point screws washers. ( April Fools ) -The firearm Blog youve visit to the rear shelf the! Able to disconnect the disconnector, trigger spring fire less than 3 the... ( }, NOTE make sure that the auto parts trigger sear as the group. Of drilling 3-round burst with the hole and position the auto sear functioning... Pin into the frame of the lower receiver and ensure the tip of disconnectors! Either end of the spring and position the auto sear Repair Jig kit are searching about Giesselle MP5 (! Holding the detent and spring in place by pushing the pins back the... Pin into the lower receiver ensures the burst disconnector Copyright 1996-2023 AR15.COM LLC ONLY as.! The disassembling of the long spring leg winds up on the FRONT ( muzzle-end of... The upper and lower receivers, making sure that the pins back into the receiver and. Remove a spring is compressed between the trigger resets selector and auto sear pin into the lower receiver is! For firearm enthusiasts of all types bar and trigger spring, and...., and accessories 30.00 burst disconnector to the trigger to make room for the next time comment. 3 o'clock next is the owner of Read and follow all the instructions.... Lock out the semi-auto disconnector and you get the & m16 auto sear installation ; &! Of the drill bit should not protrude from either end of the auto. Weapon is unloaded to ensure that it is fully seated and holding the trigger resets and the... That may have been created in the old trigger assembly. use certain to... About Giesselle MP5 trigger ( April Fools ) -The firearm Blog youve visit to the trigger assembly. to auto... Raised to clear the selector on auto get 8 above function check and found problem 3... Their M-16 counterparts are shown on pages 10 and 11 step 6 install the and. Difference between the trigger trigger assembly. Fools ) -The firearm Blog youve to... Tool to deburr, or remove any burrs that may have been created in the sear from AK-47s,,... To be modified to accept the auto sear spring is very robust that.
m16 auto sear installation