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Rainier Arms, LLC

Rainier Arms AR-15 MUR Mountain Upper Receiver

Rainier Arms AR-15 MUR Mountain Upper Receiver
Only 4 left

Availability: In stock




Description: Rainier Arms Custom

Our Rainier Arms Mountain MUR upper receiver group was designed for the enthusiast that's looking for an awesome foundation for their next upper build using our 16" 1:7 twist Mountain series barrel, the Vltor MUR upper receiver group and Lo Profile gas block. The rest is entirely up to the customer and can be easily built out.

Does NOT come with a BCG, Muzzle device, Charging handle or handguard. Component List:

  • Rainier Arms Mountain Series 16" Mid Weight Barrel
  • Midlength Gas System with 1:7 Twist
  • Rainier Arms Match Lo Pro gas block
  • Vltor MUR Upper receiver with UPK
  • Rainier Arms Barrel nut
  • Gas tube
  • Weight: 2lbs 7oz

Additional Info

Additional Info

SKU RA1501
Manufacturer Rainier Arms, LLC
Finish No
Barrel Length No
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.

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At Rainier Arms you can find the best AR15 Upper Receiver. The Rainier Arms AR-15 MUR Mountain Upper Receiver can be purchased for $565.90. Go to to buy your Rainier Arms AR-15 MUR Mountain Upper Receiver now.