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Full Auto Bolt Carrier Group
- Thread starter JERRYS.
- Start date
whats the difference between the full auto BCG and the regular ones? can the full auto one be used in a non-automatic AR15?
The back of the carrier is cut to engage the auto sear... that’s it. Gives a little more meat/weight at the rear of the carrier, compared to “semi-auto” carriers which are cut to not engage the auto sear, if present.
They can be used in non-machine guns. The third hole for the auto sear is what makes it a machine gun; not the M16 bolt carrier.
great, thanks, ordered.The back of the carrier is cut to engage the auto sear... that’s it. Gives a little more meat/weight at the rear of the carrier, compared to “semi-auto” carriers which are cut to not engage the auto sear, if present.
They can be used in non-machine guns. The third hole for the auto sear is what makes it a machine gun; not the M16 bolt carrier.
+1, 100% correct. I really prefer them at they are a tad heavier and seem to run better.The back of the carrier is cut to engage the auto sear... that’s it. Gives a little more meat/weight at the rear of the carrier, compared to “semi-auto” carriers which are cut to not engage the auto sear, if present.
They can be used in non-machine guns. The third hole for the auto sear is what makes it a machine gun; not the M16 bolt carrier.
All the bolt carriers in the early ARs were the M16 type, including the ones in the semi autos. Not sure just when, after the 70s, the semi auto bolt carrier was created by cutting a chunk of metal out of the regular bolt carrier, so that it could not hit the auto sear, if the sear was present.
The original standard bolt carrier (from the M16 but used in both guns) became known as the "full auto" bolt carrier.
Pretty sure this was done to get around certain (state mostly) laws about "machine gun parts".
Back in the 60s when the AR-15 was offered on the civilian market, and up through the 70s, generally, the ATF didn't care what parts were in the gun, only about whether it functioned as a full auto, or not.
Later on, they got a lot more picky....like declaring the auto sear (by itself) to be a machine gun....and some other things that didn't and still don't make sense to me...
and they put more emphasis on the "or readily converted to" language in the law.
Open bolt semi autos went away because of that, as well...
The original standard bolt carrier (from the M16 but used in both guns) became known as the "full auto" bolt carrier.
Pretty sure this was done to get around certain (state mostly) laws about "machine gun parts".
Back in the 60s when the AR-15 was offered on the civilian market, and up through the 70s, generally, the ATF didn't care what parts were in the gun, only about whether it functioned as a full auto, or not.
Later on, they got a lot more picky....like declaring the auto sear (by itself) to be a machine gun....and some other things that didn't and still don't make sense to me...
and they put more emphasis on the "or readily converted to" language in the law.
Open bolt semi autos went away because of that, as well...