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.

Dark mode is

View as Grid List

10 Items

per page
  1. Fortis MFG AR-15 REV 2.0 Free Float Rail System - FDE
    Fortis MFG AR-15 REV 2.0 Free Float Rail System - FDE
  2. Fortis MFG AR-15 REV 2.0 Free Float Rail System - OD Green
    Fortis MFG AR-15 REV 2.0 Free Float Rail System - OD Green
  3. Ballistic Advantage AR-15 Enhanced Upper Receiver
    Ballistic Advantage AR-15 Enhanced Upper Receiver
    $113.99
  4. Ballistic Advantage BA-10 Upper Receiver
    Ballistic Advantage BA-10 Upper Receiver
    $142.50
  5. Faxon Firearms FF-22 Receiver for Ruger 10/22
    Faxon Firearms FF-22 Receiver for Ruger 10/22
    $170.20
  6. Centurion Arms CM4 5.56 Forged Upper Receiver
    Centurion Arms CM4 5.56 Forged Upper Receiver
    $109.25
  7. Faxon Firearms AR-15 G3 STREAMLINE Aluminum M-LOK Handguard - 13"
    Faxon Firearms AR-15 G3 STREAMLINE Aluminum M-LOK Handguard - 13"
    $165.60
  8. Aero Precision AR-15 M4E1 Stripped Lower Receiver - ODG Anodize
    Aero Precision AR-15 M4E1 Stripped Lower Receiver - ODG Anodize
    $139.99
  9. Aeroknox AX // 15 Handguard M-LOK
    Aeroknox AX // 15 Handguard M-LOK
  10. Angstadt Arms Ultralight M-LOK Handguard
    Angstadt Arms Ultralight M-LOK Handguard
View as Grid List

10 Items

per page
Google Customer Reviews Google Customer Reviews