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  1. JBrewman

    Select Fire Trigger Assembly in an AR-15

    For me, it's more about having the freedom to choose, rather than how reasonable it is to modify a firearm. It's about the freedom of choice to me, and that's why I find this topic to be important.
  2. JBrewman

    Select Fire Trigger Assembly in an AR-15

    Thanks for the reply. Could you provide me with your source of information? From what I've seen written by the BATF, it's perfectly legal to own machine gun parts in an AR-15, such as the M16 bolt carrier. The bolt is not considered a full-auto part, but it is a key component in allowing full-auto operation... however it is also used in semi-auto operation. Thus, it is not strictly a full-auto part... it is just a part in a machine gun. Similarly, an M16 trigger, disconnector, and hammer can operate in both semi-automatic and full-automatic modes. They are all key components in allowing full-auto operation, but they do not cause full-automatic operation without additional parts. The additional parts needed are an automatic sear (dias or gi) and a selector. The hammer operates the same as an AR-15 hammer unless you have an auto-sear. The trigger & disconnector act the same as an AR-15 trigger and disconnector unless you have an M16 selector. The ATF handbook specifically calls out possession of a trigger, bolt, hammer, disconnector, AND SELECTOR as being a machine gun. This is the entire FCG. I'm just asking about the hammer, disconnector, and trigger while using a semi-auto selector. The unmodified semi-auto selector will not allow the disconnector to retract enough to fire in full auto. Granted if the gun did double fire or bump fire accidently, it could be charged with constructive possession since it does have an M16 part in it. From what I can tell, it's perfectly legal unless the ATF is just looking for a reason to put you in prison. However, if there is evidence to show that this is in fact illegal, I'd like to hear it.
  3. Is it legal to put a Select Fire Trigger Assembly in an AR-15 with an AR-15 selector? I know it is illegal to put a full-auto selector or sear in an AR-15 along with it. Without the M16 selector, the M16 disconnector will only operate in semi-auto. The M16 selector allows the disconnector to be retracted in full auto mode, thus allowing full-auto. The AR-15 forces the disconnector to catch the hammer after every shot. So as it stands, a Select-Fire Trigger Assembly in an unmodified AR-15 lower with an AR-15 selector is only capable of firing in semi-auto. I wouldn't want to buy one and get in trouble for it being too easy to turn into full-auto though. It would need an M16 selector and sear to operate reliably in full-auto. With just the M16 selector, it'd be an unreliable/broken full-auto (unless I'm mistaken).
  4. JBrewman

    How does an M16 operate without a sear?

    The selector operates the position of the disconnector. Semi sets it so the disconnector catches the hammer every shot. I got looking at the operation of an M16 in an animated GIF, and it looks like the full-auto selector pulls the disconnector out of the way all-together. So the disconnector doesn't catch the hammer at all; the auto-sear catches the hammer as the bolt goes back & releases the hammer at the right time as the bolt goes forward. If the auto-sear were removed and the selector was put in full-auto mode, the hammer would never catch on anything. Instead, the bolt would push it back, and the hammer would rise back up after being pushed down. I'm not sure exactly what this would do, but here is what I think will happen: The hammer will spring back up and ride along the bottom of the bolt & firing pin. Once the firing pin goes in front of the hammer, the hammer would spring it forward. The hammer would push the firing pin in and could have enough force to ignite some primers. The hammer wouldn't produce as much force compared to having a sear to hold it back temporarily. 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. i.e. it might fire, it might not.. but it will not fire in semi because the disconnector never catches the hammer for a full-auto pull. This would explain why the ATF still considers a full auto hammer, trigger, disconnector, and selector to be a machine gun.
  5. If the sear were taken out of an M16 and the selector were set to auto/tri-burst, what would happen as the trigger is pulled? Would the hammer lock back in place like in semi-auto, or would it spring back up with the bolt and cause a double? Seems as though the second would happen, but I want to make sure. I don't want to mess with doubling, it's purely educational.