Rifleman Review: Rock River Arms RRA .17 HMR

Published on April 23, 2025
Duration: 3:16

This Rifleman Review covers the Rock River Arms (RRA) .17 HMR semi-automatic rifle, detailing its construction, unique delayed blowback gas system, and performance. The review highlights its compatibility with various .17 HMR ammunition weights and its suitability for varmint hunting, noting its suppressor-ready barrel.

Quick Summary

The Rock River Arms .17 HMR rifle features a unique gas-operated, delayed blowback system with a ball detent to manage bolt pressure. It reliably functions with 15.5 to 20-grain .17 HMR ammunition and has a suppressor-ready 1/2x28 threaded barrel.

Chapters

  1. 00:15Introduction to RRA .17 HMR Rifle
  2. 00:43Rifle Dimensions and Weight
  3. 00:49Stock and Handguard Features
  4. 00:57Receiver and Lower Components
  5. 01:13Unique Gas System Explained
  6. 01:42.17 HMR Cartridge Overview
  7. 01:53Ammunition Compatibility and Testing
  8. 02:06Range Performance and Shooting Impressions
  9. 02:11Flash Hider and Threading
  10. 02:24Magazine and M-LOK System
  11. 02:45Conclusion and Recommendation

Frequently Asked Questions

What is the unique operating system of the Rock River Arms .17 HMR rifle?

The Rock River Arms .17 HMR rifle utilizes a gas-operated, delayed blowback system. This design incorporates a ball detent within the upper receiver that temporarily holds the bolt, reducing barrel pressure before the bolt cycles rearward.

What types of .17 HMR ammunition does the RRA rifle reliably function with?

In testing, the Rock River Arms .17 HMR rifle demonstrated reliable function with .17 HMR ammunition featuring bullet weights from 15.5 grains up to 20 grains. This range aligns with the manufacturer's intended operational parameters for the firearm.

Is the Rock River Arms .17 HMR rifle suppressor-ready?

Yes, the rifle features a barrel threaded with a 1/2x28 pitch. This standard threading allows for the easy attachment of suppressors, making it a suitable platform for suppressed shooting, which is often desired for varmint hunting.

What are the key external features of the Rock River Arms .17 HMR rifle?

The rifle includes a Magpul SLK six-position adjustable stock, a lightweight aluminum M-LOK handguard with ample accessory mounting slots, an RRA A4 upper receiver, an A2 style lower receiver, an enlarged trigger guard, and a left-side safety selector.

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