Sons of Liberty Gun Works and Aaron Cowan of Sage Dynamics teamed up to build a hard use AR pistol ready to handle whatever comes its way, and now Brownells has teamed up with SOLGW to offer the upper receiver as a stand alone part to go on the AR-15 SBR or Pistol lower of your choice. The Sage Dynamics upper receiver has a 12.5" barrel made from 4150 chrome moly vanadium that has been high pressure tested and magnetic particle tested. The barrel has a carbine length gas system, a 1-7 rate of twist, and a muzzle threaded 1/2-28. A muzzle device has been omitted as we know so many customers are running different kinds of suppressors and prefer to mount a muzzle device Mfg: Sons Of Liberty Gun Works
