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Rock River Arms 18 Inch - Varmint A4 - Upper


The Rock River Arms 18 Inch Varmint A4 Upper features a Rock River Arms 18 inch stainless steel, cryo-treated, air guaged bull barrel chambered in .223 Wylde with a 1:8 twist, mid-length gas system and a target crown muzzle.  Built on a Rock River Arms forged A4 upper receiver with a Rock River Arms TRO-MID free float handguard and a low profile gas block.

The .223 Wylde chamber was designed as a match chambering for semi-automatic rifles. It will accomodate both .223 Rem and 5.56mm NATO ammunition. It is relieved in the case body to aid in extraction and features a shorter throat for improved accuracy.

Complete with Rock River Arms AR-15 bolt carrier assembly and forged charging handle..

These are built and test fired by PK Firearms, using Factory Rock River Arms parts.