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What kinds of steel are the bolt and the carrier made with ? — 1 Answer

by Notme, from AL, United States Asked on January 8, 2022

Name Angstadt Arms Angstadt Bolt Carrier Group (BCG) 5.56 Ar-15 Black Nitride (5)
$139.00 $133.99 Save $5.01
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Answered by Ethan, Gear Expert, from IL, United States, on January 27, 2022

The Angstadt Arms Angstadt Bolt Carrier Group specifications are:
Machined from 8620 alloy steel with a QPQ black nitride finish
5.56 Bolt is machined from Carpenter 158 tool steel
High pressure tested (HPT) and magnetic particle inspected (MPI)
Shot peened
M16-cut/full auto capable carrier
Properly staked gas key secured to the carrier with grade 8 fasteners
Carrier has forward assist serrations

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Last updated 2025-11-12 UTC.