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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. Ballistic Advantage AR-15 Enhanced Upper Receiver
    Ballistic Advantage AR-15 Enhanced Upper Receiver
    $113.99
  2. WMD Guns 5.56 Accent Build Kit - FDE
    WMD Guns 5.56 Accent Build Kit - FDE
    $115.00
  3. Midwest Industries AK Drop-In Universal M-LOK Handguard
    Midwest Industries AK Drop-In Universal M-LOK Handguard
    $110.95
  4. Fortis MFG Control Shield 5.56
    Fortis MFG Control Shield 5.56
    $110.15
  5. Hera Arms Side Folding Unit (SFU)
    Hera Arms Side Folding Unit (SFU)
    $119.00
  6. Heavy Buffer CAR-10 Buffer and .308 Carbine Buffer Spring
    Heavy Buffer CAR-10 Buffer and .308 Carbine Buffer Spring
    $115.00
  7. Faxon Firearms Light Tapered 9mm AR-15 Barrel - 8.5"
    Faxon Firearms Light Tapered 9mm AR-15 Barrel - 8.5"
    $115.00
  8. Aero Precision AR15 STRIPPED LOWER RECEIVER GEN 2 - BLACK
    Aero Precision AR15 STRIPPED LOWER RECEIVER GEN 2 - BLACK
    $119.99
  9. Aero Precision AR15 Enhanced Carbine Buffer Kit - H3
    Aero Precision AR15 Enhanced Carbine Buffer Kit - H3
    $114.99
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