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. Rainier Arms Select 5.56 NATO AR-15 Barrel - 12.5"
    Rainier Arms Select 5.56 NATO AR-15 Barrel - 12.5"
    $195.00
  2. WMD Guns AR15 Bolt Carrier Group - NiB-X (Black)
    WMD Guns AR15 Bolt Carrier Group - NiB-X (Black)
    $190.00
  3. Hiperfire Xtreme 2 Stage AR15/10 Trigger Assembly - Mod-1
    Hiperfire Xtreme 2 Stage AR15/10 Trigger Assembly - Mod-1
    $190.00
  4. Hiperfire Xtreme 2 Stage AR15/10 Trigger Assembly - Mod-2
    Hiperfire Xtreme 2 Stage AR15/10 Trigger Assembly - Mod-2
    $190.00
  5. Bootleg Adjustable AR-15 Complete Bolt Carrier Group
    Bootleg Adjustable AR-15 Complete Bolt Carrier Group
    $199.95
  6. Aero Precision M5 (.308) ASSEMBLED UPPER RECEIVER - BLK
    Aero Precision M5 (.308) ASSEMBLED UPPER RECEIVER - BLK
    $194.99
  7. Cross Machine Tool (CMT) UPUR-1 Billet Upper Receiver
    Cross Machine Tool (CMT) UPUR-1 Billet Upper Receiver
    $198.00
  8. Ballistic Advantage Hanson 300BLK AR-15 Barrel - 8.3"
    Ballistic Advantage Hanson 300BLK AR-15 Barrel - 8.3"
    $199.50
  9. Nemo Arms 5.56 NATO AR-15 Barrel - 11.5"
    Nemo Arms 5.56 NATO AR-15 Barrel - 11.5"
    $199.00
  10. Lantac E-CT1 SINGLE STAGE TRIGGER
    Lantac E-CT1 SINGLE STAGE TRIGGER
  11. Angstadt Arms Pistol Caliber Upper Receiver
    Angstadt Arms Pistol Caliber Upper Receiver
    $195.00
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