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. SIG SAUER MCX Rattler 300BLK Complete Upper - 5.5"
    SIG SAUER MCX Rattler 300BLK Complete Upper - 5.5"
    Special Price $1,759.99 Regular Price $1,999.99
  2. Faxon Firearms AR-15 9mm FX910-U Complete Upper -10.5"
    Faxon Firearms AR-15 9mm FX910-U Complete Upper -10.5"
    $492.20
  3. Faxon Firearms AR-15 9mm FX916-U Complete Upper -16"
    Faxon Firearms AR-15 9mm FX916-U Complete Upper -16"
    $506.00
  4. Arms Republic 9mm Complete Upper Assembly - 16"
    Arms Republic 9mm Complete Upper Assembly - 16"
    $460.00
  5. Dead Foot Arms AR-15 AR-SD 9MM Upper Assembly
    Dead Foot Arms AR-15 AR-SD 9MM Upper Assembly
  6. Sig Sauer MCX Spear - LT 7.62X39 Complete Upper 11.5"
    Sig Sauer MCX Spear - LT 7.62X39 Complete Upper 11.5"
    $1,999.99
  7. Angstadt Arms 16″ 9mm Complete Upper Assembly
    Angstadt Arms 16″ 9mm Complete Upper Assembly
    $629.00
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