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. SIG SAUER MCX Rattler 300BLK Complete Upper - 5.5"
    SIG SAUER MCX Rattler 300BLK Complete Upper - 5.5"
    Special Price $1,759.99 Regular Price $1,999.99
  2. Rainier Arms MK12 223 Wylde Partial Upper Receiver - 18"
    Rainier Arms MK12 223 Wylde Partial Upper Receiver - 18"
    $1,050.00
  3. Sig Sauer MCX Spear - LT 7.62X39 Complete Upper 11.5"
    Sig Sauer MCX Spear - LT 7.62X39 Complete Upper 11.5"
    $1,999.99
  4. Q LLC Sugar Weasel Upper 300BLK 13"
    Q LLC Sugar Weasel Upper 300BLK 13"
    $1,125.00
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