by David Crane
Precision Reflex Inc. (PRI) has a new 6.8x43mm REM SPC (Special Purpose Cartridge) upper receiver designed/developed to replace any AR-15/M16-based weapon’s 5.56x45mm upper receiver.
Noted gunwriter Gary Paul Johnston has stated that the new PRI 6.8mm REM SPC uppers "have…
proven 1-MOA accurate or better". These uppers are available with either 18.5" or 16.5" free-float Rock barrels with "a host of options available". These uppers can also be had in 5.56x45mm (.223 caliber).