Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver

Introducing the RUC DI Partial Upper. Bringing the highest quality parts to the market, while offering the best value as well. This partial upper utilizes a direct impingement operating system on our new and improved Rainier Arms Select barrel. Pairing up with our Urban Combat Rail to provide shooters with a rock solid handguard that can take any abuse. Throw in your favorite charging handle and bolt carrier group and you are good to go!

Upper Build:

• Rainier Arms Select 5.56 NATO Barrel Lengths:
  • 10.5"
  • 16"
• Rainier Arms Forged Upper Receiver
• Rainier Arms Urban Combat Rail Length:
  • 10.5": 9.5"
  • 16": 15"
• Rainier Arms Low Profile .750 Gas Block (Gasblock pinned)
• Rainier Arms FHV2 Flash Hider - Black Nitride

PLEASE NOTE: Barrel and Muzzle Device is not pinned and welded.