The Rock River Arms LAR-15X Varmint A4 in .223 Rem/5.56 NATO (MPN XAR1520) is a semi-automatic varmint rifle built around a 20-inch, .920-diameter stainless steel bull barrel with a 1:8 twist rate for extended-range accuracy. Rock River Arms fits a 17-inch free-float aluminum M-Lok handguard, a Hogue grip, and an A2 fixed stock, with no muzzle brake to keep the barrel profile clean. An RRA two-stage varmint trigger provides a crisp break, backed by an oversized winter trigger guard for gloved hands, and the flat-top upper receiver ships optics-ready. The rifle feeds from a detachable 20-round magazine, shipping with an RRA case and one magazine. Among AR-platform rifles in the AR rifles category, the Varmint A4 favors predator and varmint hunters who want a heavy bull barrel and a dedicated two-stage trigger.

Key Specifications

• Chambered in .223 Rem/5.56 NATO with a 1:8-inch twist rate.
• Features a 20-inch, .920-diameter stainless steel bull barrel.
• Includes a 17-inch free-float aluminum M-Lok handguard.
• Fitted with a Hogue grip and A2 fixed stock.
• Includes an RRA two-stage varmint trigger.
• Fitted with an oversized winter trigger guard.
• Ships on a flat-top upper receiver, optics-ready.
• Feeds from a detachable 20-round magazine.
• Ships with an RRA case and one magazine.
• Weighs approximately 9.4 pounds.

Frequently Asked Questions

What barrel does this rifle use? A 20-inch, .920-diameter stainless steel bull barrel with a 1:8-inch twist.

What trigger does this rifle use? An RRA two-stage varmint trigger.

Buy the Rock River Arms LAR-15X Varmint A4

A heavy bull barrel and a dedicated two-stage trigger is exactly what the Varmint A4 delivers. As soon as it is ready to ship, order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.