6.5 Grendel Bolt Carrier Groups
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6.5 Grendel needs its own bolt: its case head is 0.441 inch, against 0.378 for 5.56, so a standard AR-15 bolt face is too small. These bolt carrier groups and bolts have the Grendel bolt face, which 6mm ARC shares. The carrier itself is a normal AR-15 carrier, and any mil-spec AR-15 lower works. Check headspace when you pair a new bolt with a barrel.
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