

Product Description
The Spike's Tactical Lightweight M16 Bolt Carrier Group (BCG) is a critical upgrade for AR-pattern builds where reliability and reduced reciprocating mass matter. Finished with a Nickel Boron coating on the bolt, carrier, and gas key, this complete BCG is designed for smoother cycling and easier cleanup. The lightweight, reduced-mass design features machining cuts to help trim weight, and it is laser engraved with the Spike’s Tactical “ST” spider logo for quick identification.
Product Highlights
- Nickel Boron coating inside and out (bolt, carrier, and gas key) for enhanced lubricity and easier cleaning
- Lightweight, reduced-mass design with weight-reduction machining cuts
- M16 profile bolt carrier group for AR-pattern rifles (does not convert an AR-15 to full auto)
- High pressure tested (HPT) and magnetic particle inspected (MPI) bolt for added confidence
- Laser engraved with the Spike’s Tactical ST spider logo
Specs
- Brand: Spike's Tactical
- Manufacturer Part Number: ST5BG05
- UPC: 855319005518
- Type: Complete bolt carrier group (BCG)
- Profile: M16
- Finish/Coating: Nickel Boron (bolt, carrier, and gas key)
- Testing: HPT/MPI bolt
- Bolt Material: Carpenter 158 steel
- Carrier/Gas Key Material: 8620 tool steel
- Weight: 10.5 oz
- Fitment (as listed): .223 Rem / 5.56 NATO / .300 Blackout
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