Originally Posted by kytowboater
ZM4/AR15 Semi Auto, Complete Bolt Group Assembly. Gas Key Installed, Carrier Chrome Plated Internaly.
Ill call Monday and ask about testing etc.
Well that's not telling you much, basically a chrome lined AR-15 SA carrier. Nothing about the bolt itself. I'd be curious to hear what they say when you call.
The following is the gold standard, BCM specs for their BCG:
•Milspec Carpenter No. 158® steel
•HPT Bolt (High Pressure Tested/ Proof)
•MPI Bolt (Magnetic Particle Inspected)
•Shot Peened Bolt
•Chrome Lined Carrier (AUTO)
•Chrome Lined Gas Key
•Gas Key Hardened to USGI Specifications
•Grade 8 Hardened Fasteners
•Key Staked Per Mil-Spec
•Tool Steel Extractor
•BCM Extractor Spring
•Black Extractor Insert
•Mil-Spec Crane O-Ring