Lightweight 18 button-rifled fluted stainless steel barrel with a 1:7.5 twist rate G10 composite free-floating handguard Picatinny railed gas block 9/16-24 threaded muzzle (non-optional). Direct impingement operating system. Ships with one 10-round magazine. Weight of upper is 4.3 pounds. This unit is 100% complete and is compatible with any standard-specification lower receiver (no modifications required).
Determined at checkout.