raineirarms

Rifle Parts

Whether you're building a new rifle from scratch or looking to upgrade an existing firearm, our vast selection of rifle parts has everything you are going to need in that journey. At Rainier Arms' selection of rifle parts, you can find a wide variety of products including lower and upper parts, trigger parts, muzzle devices, and many more. 

Explore our selection of high-quality parts coming from various leading manufacturers like Strike Industries, Magpul, BCM, and many more.

Also, don't forget to check our specially-made Rainier Arms barrels for your firearms.

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  1. Spinta Precision AR-15 300BLK Cold Hammer Forged Barrel - 8" (Limited Production)
    Spinta Precision AR-15 300BLK Cold Hammer Forged Barrel - 8" (Limited Production)
    Special Price $149.99 Regular Price $199.99
  2. Rainier Arms RUC DI 300BLK Partial Upper Receiver - 10.7"
    Rainier Arms RUC DI 300BLK Partial Upper Receiver - 10.7"
    Special Price $400.00 Regular Price $500.00
  3. Faxon Firearms Gunner 300BLK AR-15 QPQ Barrel - 16"
    Faxon Firearms Gunner 300BLK AR-15 QPQ Barrel - 16"
    $165.60
  4. Heresy Design AUG Barrel Conversion Kit 300BLK - 16.3"
    Heresy Design AUG Barrel Conversion Kit 300BLK - 16.3"
    $799.95
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