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. Griffin Armament Suppressor Optimized Buffer - Gen 2
    Griffin Armament Suppressor Optimized Buffer - Gen 2
    $52.00
  2. TruCalibre AR-15 Enhanced Billet Bolt Catch
    TruCalibre AR-15 Enhanced Billet Bolt Catch
    $36.00
  3. TruCalibre AR-15 Enhanced Safety Selector
    TruCalibre AR-15 Enhanced Safety Selector
    $43.00
  4. SB Tactical FS1913 Folding Brace Aluminum Strut
    SB Tactical FS1913 Folding Brace Aluminum Strut
    $199.99
  5. TruCalibre AR-15 Enhanced Mag Button
    TruCalibre AR-15 Enhanced Mag Button
    $8.00
  6. TruCalibre AR-15 Enhanced Magazine Button and Catch
    TruCalibre AR-15 Enhanced Magazine Button and Catch
    $17.00
  7. RS Regulate Optional Smooth End Cap
    RS Regulate Optional Smooth End Cap
    $44.00
  8. Rainier Arms MK12 223 Wylde Partial Upper Receiver - 18"
    Rainier Arms MK12 223 Wylde Partial Upper Receiver - 18"
    $1,050.00
  9. Geissele MK14 AR-15 Super Modular Rail
    Geissele MK14 AR-15 Super Modular Rail
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