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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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  7. Maxim Defense MDX 508 7.62x39 Mil-Spec Complete Upper - 8.5"
    Maxim Defense MDX 508 7.62x39 Mil-Spec Complete Upper - 8.5"
    $1,255.50
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  9. Rainier Arms Exclusive Faxon Firearms 300BLK Chrome Lined 4150 5R Barrel - 8.5"
    Faxon Firearms 300BLK Chrome Lined 4150 5R Barrel - 8.5"
    $189.00
    Out of stock
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  10. Faxon Firearms 9mm SAAMI Light Tapered 4150 QPQ Barrel - 8.5"
    Faxon Firearms 9mm SAAMI Light Tapered 4150 QPQ Barrel - 8.5"
    $115.00
    Out of stock
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  11. Bootleg Mil Spec AR-15 300BLK CamLok (M-Lok) Partial Upper - 8.5"
    Bootleg Mil Spec AR-15 300BLK CamLok (M-Lok) Partial Upper - 8.5"
    $489.00
    Out of stock
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  12. Rainier Arms Exclusive Rainier Arms / Rellim Arms AR-15 .223 Wylde Take Down Upper Receiver Assembly - 8.5"
    Rainier Arms / Rellim Arms AR-15 .223 Wylde Take Down Upper Receiver Assembly - 8.5"
    $1,199.99
    Out of stock
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  13. Maxim Defense MDX 508 300 BLK Mil-Spec Complete Upper - 8.5"
    Maxim Defense MDX 508 300 BLK Mil-Spec Complete Upper - 8.5"
    Out of stock
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  14. Noveske 300 Blackout Barrel w/ HS Bolt
    Noveske 300 Blackout Barrel w/ HS Bolt
    Out of stock
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  15. Maxim Defense MDX 508 5.56 Mil-Spec Complete Upper - 8.5"
    Maxim Defense MDX 508 5.56 Mil-Spec Complete Upper - 8.5"
    Out of stock
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