Spike's Tactical HPT/MPI Shot Peened BCG 223/5.56 AR15 M16
PREMIUM BCG AT AN OUTSTANDING PRICE!
Bolt carrier group specifications-
-Mil-Spec 8620 tool steel M16 bolt carrier w/shrouded firing pin. Added weight to improve cycling and reduce felt recoil.
-Carrier has 18.104.22.168 MIL-STD-171 phosphate finish inside and out with 22.214.171.124 MIL-STD-171 hard chrome bore.
-Laser engraved with ST Spider logo (visable through ejection port door opening).
-Mil-Spec tool steel carrier key.
-Carrier key has 126.96.36.199 MIL-STD-171 phosphate finish inside and out with 188.8.131.52 MIL-STD-171 hard chrome bore.
-Carrier key is attached with Grade 8 hardware and properly staked per the Mil-Spec.
-Bolts are CNC machined from Carpenter No. 158®.
-Bolts have 184.108.40.206 MIL-STD-171 phosphate finish inside and out.
-All bolts are shot peened per the current Mil-Spec to relieve metal strain
-All bolts (NOT JUST A SAMPLING) are Individually High Pressure Tested (HPT) and then Individually Magnetic Particle Inspected (MPI).
-Tool steel extractor, shot peened, 220.127.116.11 MIL-STD-171 phosphate finish, fitted with a Mil-Spec black extractor spring insert and Mil-Spec Viton o-ring to avoid most extraction problems.
-Mil-Spec firing pin with 18.104.22.168 MIL-STD-171 hard chrome finish.
-Mil-Spec cam pin with 22.214.171.124 MIL-STD-171 phosphate finish.
-Mil-Spec firing pin retaining pin with 126.96.36.199 MIL-STD-171 phosphate finish.
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.