Colt M16 BCG

**spacemanvic** · January 11th, 2011, 02:50 AM

Is a Colt M16a1/A2 BCG that has had its carrier converted to SA any good? My understanding is that Colt converted them by cutting the bottom half of the sear on the bolt carrier.

**Suburban** · January 11th, 2011, 03:08 AM

Originally Posted by spacemanvic

Is a Colt M16a1/A2 BCG that has had its carrier converted to SA any good? My understanding is that Colt converted them by cutting the bottom half of the sear on the bolt carrier.

The new semi-auto only Colt Defense carbines (6920, 6940, etc.) come with full-on M-16 bolt carriers. They never really needed to cut away the rear underside of the carriers like they used to in the 80s and 90s. The auto sears go in the lowers, and the bolt carrier can't make the rifle fire full-automatic without an M-16 hammer, selector, disconnector, and auto sear.

**The_War_Wagon** · January 11th, 2011, 08:08 AM

[quote=spacemanvic;1456949]Is a Colt M16a1/A2 BCG that has had its carrier converted to SA any good? quote]

FUNCTIONAL? Yes. "Good?" No.

The extra weight of the F/A carrier is what's useful about it in a semiautomatic rifle; helps with cycling the rifle more effectively. It'll FUNCTION, but you'd be better off with a FULL carrier.

**spacemanvic** · January 11th, 2011, 08:42 AM

[QUOTE=The_War_Wagon;1457025]

Originally Posted by spacemanvic

Is a Colt M16a1/A2 BCG that has had its carrier converted to SA any good? quote]

FUNCTIONAL? Yes. "Good?" No.

The extra weight of the F/A carrier is what's useful about it in a semiautomatic rifle; helps with cycling the rifle more effectively. It'll FUNCTION, but you'd be better off with a FULL carrier.

Thats what I was thinking. Found a site with a list of weights for a number of BCG's and the modified Colt came in at the lightest.

**Watchman** · January 11th, 2011, 11:03 AM

Even though the added weight helps with cycling in the carbine length gas tube I've always been curious about the technicality of a full auto carrier in regards to the rules. As I understand it, any part intended for full auto function is not allowed. Since everyone sells full auto carriers I assume the rule only applies to the fire control group but since it is an assumption, can anyone chime in for specifics? Just curious. Thanks.

**Suburban** · January 11th, 2011, 01:08 PM

ATF letter RE:M-16 bolt carriers in AR-15 rifles attached. There is another one floating around, but I seem to have lost my copy.

**orionz06** · January 11th, 2011, 01:24 PM

Originally Posted by Watchman

Even though the added weight helps with cycling in the carbine length gas tube I've always been curious about the technicality of a full auto carrier in regards to the rules. As I understand it, any part intended for full auto function is not allowed. Since everyone sells full auto carriers I assume the rule only applies to the fire control group but since it is an assumption, can anyone chime in for specifics? Just curious. Thanks.

I dont know specifics, but you are fine to use one.

**Watchman** · January 11th, 2011, 05:07 PM

Originally Posted by Suburban

ATF letter RE:M-16 bolt carriers in AR-15 rifles attached. There is another one floating around, but I seem to have lost my copy.

Good clarification in the last sentence. "If it did not result in the production of a weapon that shoots automatically, it would be lawful to posses and make."

Thanks for the pictures, saved for posterity.