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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 MPX G2 9mm Barrel - 8"
    Sig Sauer MPX G2 9mm Barrel - 8"
    Special Price $639.99 Regular Price $699.99
  2. Faxon Firearms Light Tapered 9mm AR-15 Barrel - 8.5"
    Faxon Firearms Light Tapered 9mm AR-15 Barrel - 8.5"
    $115.00
  3. Angstadt Arms 16″ 9mm Complete Upper Assembly
    Angstadt Arms 16″ 9mm Complete Upper Assembly
    $629.00
  4. R&D Precision 9mm PW9 AR-15 Barrel - 7.25"
    R&D Precision 9mm PW9 AR-15 Barrel - 7.25"
    $99.99
  5. Faxon Firearms Light Tapered 9mm AR-15 Barrel - 10.5"
    Faxon Firearms Light Tapered 9mm AR-15 Barrel - 10.5"
    $124.20
  6. Faxon Firearms AR-15 9mm FX916-U Complete Upper -16"
    Faxon Firearms AR-15 9mm FX916-U Complete Upper -16"
    $506.00
  7. Faxon Firearms Light Tapered 9mm AR-15 Barrel - 16"
    Faxon Firearms Light Tapered 9mm AR-15 Barrel - 16"
    $133.40
  8. JK Armament 155LT Compensator End Cap - 9MM
    JK Armament 155LT Compensator End Cap - 9MM
    $77.40
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