Parts & AccessoriesPartsSpikes Tactical BCG Bolt Carrier Group MPI Bolt Ph

Spikes Tactical BCG Bolt Carrier Group MPI Bolt Ph

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Product Description

Spike's Tactical HPT/MPI M16 Bolt Carrier Group (223/5.56).
Bolt carrier group specifications
Mil-Spec 8620 tool steel M16 bolt carrier w/shrouded firing pin.
Carrier has 5.3.1.2 MIL-STD-171 phosphate finish inside and out with 1.2.2.2 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 5.3.1.2 MIL-STD-171 phosphate finish inside and out with 1.2.2.2 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 5.3.1.2 MIL-STD-171 phosphate finish inside and out.
All bolts are shot peened per the current Mil-Spec.
All bolts are Individually High Pressure Tested (HPT) and then Individually Magnetic Particle Inspected (MPI).
Tool steel extractor, shot peened, 5.3.1.2 MIL-STD-171 phosphate finish, fitted with a Mil-Spec black extractor spring insert and Mil-Spec Viton o-ring.
Mil-Spec firing pin with 1.2.2.2 MIL-STD-171 hard chrome finish.
Mil-Spec cam pin with 5.3.1.2 MIL-STD-171 phosphate finish.
Mil-Spec firing pin retaining pin with 5.3.1.2 MIL-STD-171 phosphate finish.
Model: ST5BG01