- Made for 7.62X51 / 308 Cal
- Nitride Treated
- HPT/MPI Tested and Marked
- 9310 Hardened Steel Bolt,
- 17-4 Stainless Steel Firing Pin (Heat treated to H900 Condition)
- 8620 carrier and gas key.
- Hardened extractor S7 tool steel.
- The group comes fully assembled with properly torqued and staked gas key
- Made in the USA