Rock River Arms RRA 20 Inch Varmint A4 Upper AR-15 556 223 AR15 AR0550X
Looking for ultimate accuracy in an AR15 upper? The Rock River 20" Cryogenically treated air guaged stainless steel barrel AR upper offers amazing performance at a best in class price. Check out the unbiased reviews at third party sites such as sniper central:
Free floated upper built for distance on a milspec Rock River forged A4 upper receiver. Complete upper includes charging handle and bcg bolt carrier group.
Caliber: Wylde Chamber for 5.56 & .223
Handguard: RRA TRO Octagonal Free Float with Top Rail
Barrel: Air Gauged Stainless Steel Bull 1:8 Twist. Diameter .920 front of gas block, 1.050 under handguard.
Gas Block: Low Profile Concealed