Faxon 6.5 Grendel/ARC Type 2 .136 Bolt

The Faxon 6.5 Grendel/ARC Type 2 bolt is the bolt head AR builders need when running 6.5 Grendel, 6mm ARC, 22 ARC, or 338 ARC on an AR-15 lower. All four cartridges share the same Type 2 (.136) bolt face, which is larger than the 5.56 NATO bolt face. A standard 5.56 BCG will not chamber or extract these cartridges, so the correct bolt is not optional.

The bolt head is machined from 9310 steel and finished in nitride. Faxon's listing explicitly covers 6.5 Grendel, 6mm ARC, 22 ARC, and 338 ARC barrel compatibility, which makes it the single bolt to buy for any of those builds. It is a bolt head only and pairs with a standard 6.5 Grendel/ARC carrier; shooters running a complete upper that already ships with a Grendel/ARC bolt do not need it.

For a 338 ARC build specifically, this bolt plus a 338 ARC barrel, a 6.5 Grendel/ARC carrier, and dedicated 400 Legend magazines completes the parts list on a standard AR-15 lower. The 9310 steel construction is the same material used in premium bolt assemblies and holds up to the higher bolt-thrust of the larger case head better than budget 8620 bolts.