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 Exclusive A3 Tactical Stribog Lower Receiver - Scorpion Magazine (LRBHO)
    A3 Tactical Stribog Lower Receiver - Scorpion Magazine (LRBHO)
    $180.45
  2. Lee Sporting Aluminum MP5 / SP5 / HK Clone Lower Housing - Full Size Semi Shelf
    Lee Sporting Aluminum MP5 / SP5 / HK Clone Lower Housing - Full Size Semi Shelf
    $299.99
  3. Lee Sporting Aluminum MP5 / SP5 / HK Clone Lower Housing - Full-Size Push-Pin
    Lee Sporting Aluminum MP5 / SP5 / HK Clone Lower Housing - Full-Size Push-Pin
    $299.99
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