Phase 5 M16 / M4 CHROME LINED BLACK PHOSPHATE COMPLETE BOLT CARRIER GROUP
Mil-Spec M16/M4 Heat treated and chrome lined carrier.
Assembled complete with cam pin, firing pin, bolt and gas key.
HPT/MPI tested Bolt.
Drop-in BCG, ready to shoot.
Finish: Standard black phosphate coating.
Bolt carrier group specifications-
-Mil-Spec 8620 tool steel Semi bolt carrier w/shrouded firing pin.
-Carrier has 220.127.116.11 MIL-STD-171 phosphate finish inside and out with 18.104.22.168 MIL-STD-171 hard chrome bore.
-Laser engraved with Phase 5 logo (visible through ejection port door opening).
-Mil-Spec tool steel carrier key.
-Carrier key has 22.214.171.124 MIL-STD-171 phosphate finish inside and out with 126.96.36.199 MIL-STD-171 hard chrome bore.
-Carrier key is attached with Grade 8 hardware and properly torqued 56 IN/LBS.
-Bolts are CNC machined from Carpenter No. 158®.
-Bolts have 188.8.131.52 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, 184.108.40.206 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 220.127.116.11 MIL-STD-171 hard chrome finish.
-Mil-Spec cam pin with 18.104.22.168 MIL-STD-171 phosphate finish.
-Mil-Spec firing pin retaining pin with 22.214.171.124 MIL-STD-171 phosphate finish.