Rainier Arms RUC Complete Lower Black

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Rainier Arms RUC Complete Lower Black


Rainier Arms Custom

We are proud to offer our RUC Complete Lower Receiver made from 7075-T6 forged aluminum with black hard coat anodized with a surface hardness of 60 Rockwell. Machined per mil-spec with critical tooling dimensions held within .001. This lower is found as standard issue on our Urban Carbine. Own the best forged lower money can buy with the upgrades for usability.


  • 7075 T6 - 6 position Milspec buffer tube - properly staked
  • Heavy Buffer
  • Rainier Arms Safety Selector Switch - Standard 90 Degree/ Short (45 Degree)
  • B5 Systems Bravo Stock
  • ALG QMS trigger
  • Fortis QD End Plate
  • RA Trigger Guard
  • Magpul MOE+ Grip

**Substitutions are not allowed. FFL Required Before Shipping.

Please have your dealer email their license to [email protected] or they can also fax it in. Please give us a few days to process the information.

More Information
Manufacturer Rainier Arms, LLC
Finish Stainless Steel
Barrel Length 16"
Caliber 300AAC
Configuration 1/2X28 Thread
Option AR15
Gas Length Pistol
Height No
Rail Length 12"
Mount Picatinny
Profile Medium Contour
Reticle No
Co Witness No
Size 9 Slot