- Caliber: 5.56 NATO / .223 / .300 BLK
- Carrier profile: Full-mass M16
- Finish: Nickel Boron coating inside and out (bolt, carrier, and gas key)
- Markings: Laser-engraved ST Spider logo
- Inspection: MPI bolt, HPT, gas key staked
Listed In: Gun Parts
Registered on 12/31/2019
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