FA BCG

[thirtydaZe]

I'm i good to go with one of these, or is it risky for the FA variety to be installed?

I've read that it's fine unless it just happens to shoot FA on accident?

What do you regular builders opt for?

[tstuart34]

Full auto BCG are find. The ATF has given blessing. A lot of people say the FA BCG run better because that is how the rife was designed to work.... I can agree with the but I also have never shot a semi auto either. 

[thirtydaZe]

Full auto BCG are find. The ATF has given blessing. A lot of people say the FA BCG run better because that is how the rife was designed to work.... I can agree with the but I also have never shot a semi auto either. 

Alright, thanks.  Like i said, i read at the other site it was fine, just wanted to double check with the NE folks.

Thanks!

[tstuart34]

Full auto is achieved in the trigger assembly and sear.... with out them no fun 

[FarmerRick]

The bolt carrier is not a regulated part.

[Dan W]

For most reliable operation you want a fully shrouded firing pin like the enhanced AR15  and M16 carriers use. All my rifles have M16 carriers installed

[thirtydaZe]

Thanks again everyone.

[DCPrecisionLLC]

There is a lot to the BCG discussion more than just reliability. Heavy bolt carriers are stronger and less prone to failure, although it's not a part very prone to failure in the first place. They also help to slow down cycle time in over gassed guns running carbine or pistol length gas systems. However, more mass moving around equals more recoil. That is why you will see some competition guns built with very lightweight BCGs, but then in a standard gas system you will get extremely fast cycle rates and the possibility of bolt bounce. So then you need to start thinking about mid or rifle length gas systems or adjustable gas blocks and heavier buffers.

Bottom line, on a standard gun, I would run a FA BCG   

[on the fritz]

There is a lot to the BCG discussion more than just reliability. Heavy bolt carriers are stronger and less prone to failure, although it's not a part very prone to failure in the first place. They also help to slow down cycle time in over gassed guns running carbine or pistol length gas systems. However, more mass moving around equals more recoil. That is why you will see some competition guns built with very lightweight BCGs, but then in a standard gas system you will get extremely fast cycle rates and the possibility of bolt bounce. So then you need to start thinking about mid or rifle length gas systems or adjustable gas blocks and heavier buffers.

Bottom line, on a standard gun, I would run a FA BCG   

..... or an adjustable gas block; but that's another aside to this discussion. 

[DCPrecisionLLC]

..... or an adjustable gas block; but that's another aside to this discussion. 

There is a lot to the BCG discussion more than just reliability. Heavy bolt carriers are stronger and less prone to failure, although it's not a part very prone to failure in the first place. They also help to slow down cycle time in over gassed guns running carbine or pistol length gas systems. However, more mass moving around equals more recoil. That is why you will see some competition guns built with very lightweight BCGs, but then in a standard gas system you will get extremely fast cycle rates and the possibility of bolt bounce. So then you need to start thinking about mid or rifle length gas systems or adjustable gas blocks and heavier buffers.

Bottom line, on a standard gun, I would run a FA BCG   

Too bad there aren't many adjustable gas block friendly rails out there right now. Unless you have one that slides completely off fairly easily.

Recoil and reliability all come down to a balance of gas pressure (adjustable gas block and system length), BCG weight, buffer and spring weight.