The Rock River Arms Varmint A4 Complete Upper Half will turn your AR carbine or rifle into a tack-driving, bull-barreled precision rifle rig! This complete upper comes with a bolt, bolt carrier and charging handle and is ready to go with a .223 Wylde chamber for .223 Remington rounds.
The upper receiver is a forged A4 type flat-top and the handguard is Rock River's Aluminum Free Float tube, which makes it easy to attach various accessories. The barrel diameter is .920" under the Picatinny rail gas block, which is RRA's Varmint Gas Block sight base. The barrel itself is a 20-inch air-gauged stainless steel bull barrel with a 1:8-inch twist, perfect for longer bullets and long range shooting.
Features and Specifications:
Rock River Arms AR-15 A4 Flat-Top Varmint Upper
Caliber: .223 Rem / 5.56 NATO
Chamber: .223 Wylde
Barrel: 20"L, Stainless Steel Bull Barrel
Rifling: 1:8" Rifling
Handguard: Aluminum Free Floating Tube
Gas Block: RRA Varmint Gas Block
Includes Bolt, Bolt Carrier And Charging Handle
Made In The USA
Fits: AR Rifles