When this thread was ressurected...
The question was asked if removal of the secondary sear would result in full automatic fire.
It is conceivable that burst may be achieved. But there is a danger to it that can damage the gun, injure the shooter and anyone near the shooter. Why? It's called timing. The purpose of the auto-sear trip is to delay the forward motion of the hammer. This gives the bolt time to lock up the action so as not to fire out of battery. Allowing the hammer to follow the bolt forward can result in the gun firing out-of-battery and firing out-of-battery is a no-no because of the safety concerns mentioned earlier. Even in a SHTF situation, I would not recommend trying it because it's better to have slow, aimed fire that allows for the barrel to cool (rather than ruin your barrel), increased hit probability than expensive bullets flying harmlessly overhead, and finally, having your gun blow up and you or someone next to you injured. To prevent firing out of battery, the gun designer introduces the selective fire mechanism which delays the hammer's fall so as to ensure proper lock-up.
My recommendation: Don't try it. Besides, it's not worth a visit from the nice gentlemen of the ATF. Spend the ducats and buy a real AC556 with the paperwork. Time outside of prison is time that may be enjoyed shooting it. That's worth every penny.
The question was asked if removal of the secondary sear would result in full automatic fire.
It is conceivable that burst may be achieved. But there is a danger to it that can damage the gun, injure the shooter and anyone near the shooter. Why? It's called timing. The purpose of the auto-sear trip is to delay the forward motion of the hammer. This gives the bolt time to lock up the action so as not to fire out of battery. Allowing the hammer to follow the bolt forward can result in the gun firing out-of-battery and firing out-of-battery is a no-no because of the safety concerns mentioned earlier. Even in a SHTF situation, I would not recommend trying it because it's better to have slow, aimed fire that allows for the barrel to cool (rather than ruin your barrel), increased hit probability than expensive bullets flying harmlessly overhead, and finally, having your gun blow up and you or someone next to you injured. To prevent firing out of battery, the gun designer introduces the selective fire mechanism which delays the hammer's fall so as to ensure proper lock-up.
My recommendation: Don't try it. Besides, it's not worth a visit from the nice gentlemen of the ATF. Spend the ducats and buy a real AC556 with the paperwork. Time outside of prison is time that may be enjoyed shooting it. That's worth every penny.