- 8620 Steel Carrier
- 4130 Steel Gas Key with Grade 8 fasteners (Staked)
- 4140 Steel Cam Pin
- M16 Auto Profile
- 6.5 Grendel Type II (.136) / 6mm ARC / .22 ARC Bolt – 9310 Steel (Shot Peened)
- Nitride
- Mil-spec Gas Rings
- MPI
- Hard Chrome Firing Pin
Purchased and not needed. Item is brand new in box, removed from original box due to a shipping label on it.

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