LMT Standard M16 Bolt Carrier Group Complete, 5.56 L7D3 BCG
Bolt carrier group specifications-
-M16 bolt carrier w/shrouded firing pin. Added weight to improve cycling and reduce felt recoil.
-Carrier has 126.96.36.199 MIL-STD-171 phosphate finish inside and out with 188.8.131.52 MIL-STD-171 hard chrome bore.
-Mil-Spec tool steel carrier key.
-Carrier key has 184.108.40.206 MIL-STD-171 phosphate finish inside and out with 220.127.116.11 MIL-STD-171 hard chrome bore.
-Carrier key is attached with Grade 8 hardware and properly staked per the Mil-Spec.
-Bolts have 18.104.22.168 MIL-STD-171 phosphate finish inside and out.
-Mil-Spec firing pin with 22.214.171.124 MIL-STD-171 hard chrome finish.
-Mil-Spec cam pin with 126.96.36.199 MIL-STD-171 phosphate finish.
-Mil-Spec firing pin retaining pin with 188.8.131.52 MIL-STD-171 phosphate finish.
-All bolts are shot peened per the current Mil-Spec to relieve metal strain
LMT BCG's include a HPT/MP tested bolt and Crane O-Ring.
LMT's branded product line was developed primarily for the US Government / Professional Market. The civilian market is a secondary benefactor to this program. As such the QC standards and priorities (and features) are very different than that of a commercial market AR15 manufacturer. To the very overwhelming majority of shooters, this is a huge plus in the LMT column. It makes their product an extremely attractive option for a civilian shooter looking for a higher standard of product.
With the primary focus being a quality standard for GI sales, there are some noteworthy differences in the product as you receive it. Specific to the LMT Bolt Carrier Groups (BCGs); they ALL come extensively test fired from the factory. As such, every single real LMT BCG on the market will have significant brass, significant carbon, and significant powder residue on the group. Regarding the utility of the BCG (everything LMT builds is focused on utility); this is a very very good thing.
Written by Bureau of Alcohol, Tobacco, Firearms and Explosives (BATFE), Chief of the Firearms Technology Branch
...M16 bolt carriers are not designed and intended solely and exclusively for use in converting a weapon into a machinegun and are not any combination of parts from which a machinegun can be assembled. Further, an M16 bolt carrier is not a firearm as defined in the GCA or a machinegun as defined in the NFA. An M16 bolt carrier is simply a machinegun part and as such its domestic sale and possession is unregulated under the Federal firearms laws. It is not unlawful to utilize a M16 machinegun bolt carrier in a semiautomatic AR15 type rifle.