The EPC-9 upper receiver is the perfect addition to any AR9 build. Including a last round bolt hold open mechanism and compatible with most standard AR15 barrel nut and handguard combinations this upper receiver will help take your pistol caliber build to the next level.
Last round bolt hold open mechanism
Accepts most AR15 compatible barrel nuts and handguards
Dimple above threads to allow for proper handguard timing
Standard AR15 takedown/pivot pin lug pattern
