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Upper Service


In stock


Please send your parts and a copy of your invoice to:

Rainier Arms LLC 
ATTN: Armorers 
4611 E 31st St S
Wichita, KS 67210

As low as $50.00
Rainier Arms Free Ground Shipping

If you do not have the tools required to build your upper or disassemble, or would like one of our gunsmiths to handle the build process. The base service will include checking headspace on your barrel and BCG, pinning the gas block to the barrel and test firing the upper to confirm function (will be test fired on you lower if provided or also built at the same time. The accurizing service also includes re-squaring the receiver face to ensure a clean interface with the barrel extension, and bedding the barrel into the upper. You will be contacted with directions for sending your components in as required.

Parts Required:

  • Upper
  • Forward Assist assembly
  • Dust cover assembly
  • BCG
  • Charging Handle
  • Barrel
  • Muzzle Device
  • Gas Block
  • Gas Tube
  • Rail System
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Product Type Services

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