Rock River Arms Operator DMR Series for Defense or Duty

Including six models, the Operator DMR Series from Rock River Arms has something for both defense and duty applications. In the series are four models chambered in .308/7.62×51 and two models chambered in .223/5.56 NATO. Likewise, featuring your choice between 16- and 20-inch barrels provides a mission-specific selection.

Rock River Arms Operator DMR (Designated Marksman Rifle) Series

.308/7.62 Models

Offered in four models, the .308/7.62 variants are available in two different barrel lengths. The OP1005BT and OP1007BT both feature a 20-inch chrome-lined barrel. Likewise, each utilizes a low-profile gas block and mid-length gas system. The barrel is housed within a 17-inch lightweight free-float M-LOK rail handguard.

In addition, each rifle builds on LAR-BT3 billet upper and lower receivers and features a BCM SOPMOD buttstock. Similarly, a Hogue beavertail grip provides the interface between man, steel, and the RRA two-stage Ultra Match trigger. Magpul Pro Series MBUS flip-up sights provide the aiming solution. However, a full-length Picatinny rail runs the top of the upper for the attachment of optics or a scope.

If you need just a little more from your rifle, the OP1007BT also includes a SilencerCo Chimera 300 suppressor. Likewise, it also includes an additional RRA 3-slot rail assembly and an ARCA Swiss Rail Adapter.

For those in need of more mobility, the OP1010BT and OP1012BT offer a 16-inch chrome-lined barrel configuration. Like the 20-inch configurations, they are built on RRA’s LAR-BT3 billet upper and lower. The barrels feature a 1:10 twist, delivering 1.5 MOA accuracy at 100 yards.

The 16-inch variants contain the same Magpul MBUS Pro sights, QD mounts, and 5-slot rail assemblies as the 20-inch models. However, the OP1012BT is also enhanced with the SilencerCo Chimera 300 suppressor, RRA 3-slot rail assembly, and ARCA Swiss Rail Adapter.

.223/5.56 NATO Models

Offered in two models, the OP1505 and OP1510 are chambered in .223/5.56 NATO, in keeping with the Designated Marksman concept. Both models are built on a framework of RRA forged LAR-15M lower and forged A4 upper receivers. Each rifle includes an RRA two-stage Ultra Match trigger for the best shooting experience. Likewise, a Hogue beavertail grip and BCM SOPMOD buttstock provide a comfortable shooting platform.

In addition, both rifles include a low-profile gas block and carbine-length gas system. A full-length Picatinny rail runs stop each rifle for the attachment of optics, scope, or accessories. Likewise, Magpul MBUS flip-up sights provide the aimpoint for those who prefer iron sights. Finally, each rifle includes an A2 flash hider, 5-slot rail assembly, and QD mount.

The key differences between the two rifles are in the barrel and handguard configuration. Specifically, the OP1505 features a 20-inch chrome-lined barrel with a 1:7 twist. The barrel is paired with RRA’s 17-inch lightweight, M-LOK compatible handguard. Likewise, the OP1510 has a shorter 16-inch chrome-lined barrel with a 1:9 twist rate. This configuration is paired with RRA’s 13-inch lightweight, M-LOK compatible handguard.