Rock River Arms rimfire rifle line just got a little zippier.

posted on January 21, 2024

Rock River Arms is rolling out the company’s first AR-platform rifle chambered for the .17 HMR cartridge, the new RRA .17 HMR. This rifle joins the company’s LAR-22 rifle lineup to round out its rimfire long gun offerings.

This rifle is well-suited for use as an accurate and reliable varmint buster or for a fun gun to ring steel across the effective ballistic range of the .17 HMR cartridge. Built on a RRA A4 billet upper receiver and forged A2 lower, the RRA 17 HMR has a precision-manufactured 41V50 CMV 18-inch barrel that is rifled with a 1:9-inch twist. The cycle of operation is managed by a gas impingement, delayed blowback system that delivers reliable operation with 15.5- to 20-grain cartridges.

The RRA NM Ultra Match 2-stage trigger inside the rifle is a key ingredient to making the most of the shooter’s accuracy potential. The rifle uses a rear charging handle for convenient operation and comes with a winter trigger guard for use when wearing gloves.

There is also an ergonomic Magpul MOE grip, adjustable Magpul MOE SL-K six-position stock and RRA’s lightweight 15-inch freefloat handguard with M-Lok compatibility. All this means that the RRA .17 HMR is adaptable to the shooter and is ready to be outfitted with essential accessories like a bipod, lights, thermal, and optic. A 10-round magazine is included. 

RRA .17 HMR Specifications

  • Upper Receiver: RRA A4 7000 Series billet
  • Lower Receiver: Forged A2, 7075 T6
  • Barrel Chamber: .17 HMR
  • Barrel Length: 18 inches
  • Barrel Material: 41V50 CMV
  • Muzzle Thread: ½-28 tpi
  • Twist Rate: 1:9-inch
  • Muzzle Device: A2 flash suppressor
  • Method of Operation: Gas impingement with delayed blowback
  • Charging Handle: Rear charging, forged 7075 T6
  • Trigger Group: Semi-automatic
  • Trigger/Hammer: NM Ultra Match 2-Stage
  • Selector: Two-position (safe/semi-automatic)
  • Buttstock: Magpul MOE SL-K 6-position (Mil-Spec)
  • Pistol Grip: Magpul MOE grip
  • Handguard: 15 inch lightweight aluminum free-float with top rail and M-Lok compatibility
  • Magazine: 10-round magazine
  • Weight (magazine empty): 7 pounds, 8 ounces
  • Length (stock collapsed): 5 inches
  • Included Accessories: One magazine, user manual

MSRP for the RRA .17 HMR is $1,300, and to see the full range of firearms, components, and accessories offered by Rock River Arms, please visit rockriverarms.com.


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