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Rainier Arms, LLC

Rainier Arms Piston RUC MOD 3.5 - 16 Black

Rainier Arms Piston RUC MOD 3.5 - 16 Black
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Availability: Out of stock




We are excited to introduce to you our new RUC MOD 3.5 with Superlative Arms .750 Adjustable Piston System. When we first introduced our RUC MOD 1 and MOD 2, our focus was to develop a rifle that integrated a lightweight design while using the highest quality components. Building on the solid foundation of our predecessors, our new RUC MOD 3.5 is a light weight, high quality and high performace rifle that is heavy on value. It features our new Rainier Arms 16" Night Rail, XTC 2.0 compensator and RA Selector Switch. We have also included MBUS Pro for the RUC Mod 3.5!

Upper Parts:

  • RA Mountain Chrome Moly 5.56mm 16" Barrel Nitride
  • 1 in 7" twist
  • Extended M4 Feed Ramps
  • MPI/HP tested Bolt
  • 1/2x28 threads
  • Mid length gas system
  • Superlative Arms .750 Adjustable Piston System
  • Rainier Arms Avalanche MOD2 Charging Handle
  • RA Forged A4 upper receiver
  • RA Night Rail 16"
  • Rainier Arms Compensator - XTC 2.0
  • Back Up Front & Rear Sights - MBUS Pro

Lower Parts:

  • RA Forged Lower
  • Mil-Spec 6 position receiver extension
  • H Buffer
  • B5 Systems Bravo Stock
  • Magpul MOE+ Grip
  • ALG QMS trigger
  • Rainier Arms Selector Switch - Standard 90 Degree/ Short (45 Degree).
  • Fortis QD end plate

Additional info:

  • One 30 rd Hexmag magazine where legal
  • Case Included
  • Weight 6 lbs 9 oz

FFL Required Before Shipping.

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

Additional Info

Additional Info

SKU RUC-P MOD 3.5 - 16 BLK
Manufacturer Rainier Arms, LLC
Finish No
Barrel Length 16"
Caliber No
Configuration No
Option No
Gas Length No
Height No
Rail Length No
Mount No
Profile No
Reticle No
Co Witness No
Size No



Feel free to ask us any question regarding this product.