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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. Noveske AR-15 Gen 3 5.56MM NSR-15 M-LOK Upper - 18" SPR
    Noveske AR-15 Gen 3 5.56MM NSR-15 M-LOK Upper - 18" SPR
    $1,520.00
    Out of stock
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  2. Daniel Defense MK18 5.56 NATO Complete Upper Receiver - 10.3" Black
    Daniel Defense MK18 5.56 NATO Complete Upper Receiver - 10.3" Black
    $1,412.00
    Out of stock
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  3. Primary Weapons Systems 300 BLK MK1 MOD 2-M Complete Upper - 9.75"
    Primary Weapons Systems 300 BLK MK1 MOD 2-M Complete Upper - 9.75"
    $1,299.95
    Out of stock
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  4. Primary Weapons Systems 300 BLK MK109 MOD 1-M Complete Upper - 9.75"
    Primary Weapons Systems 300 BLK MK109 MOD 1-M Complete Upper - 9.75"
    $1,029.49
    Out of stock
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  5. Primary Weapons Systems .223 Wylde MK116 MOD 1-M Complete Upper - 16.1"
    Primary Weapons Systems .223 Wylde MK116 MOD 1-M Complete Upper - 16.1"
    $1,029.49
    Out of stock
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  6. Maxim Defense MDX 505 PDX 7.62x39 Mil-Spec Complete Upper - 5.5" Urban Grey
    Maxim Defense MDX 505 PDX 7.62x39 Mil-Spec Complete Upper - 5.5" Urban Grey
    $1,165.50
    Out of stock
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  7. Maxim Defense MDX 505 PDX 5.56 NATO Mil-Spec Complete Upper - 5.5" Urban Grey
    Maxim Defense MDX 505 PDX 5.56 NATO Mil-Spec Complete Upper - 5.5" Urban Grey
    $1,165.50
    Out of stock
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  8. 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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  9. Rainier Arms Exclusive Rainier Arms / Rellim Arms AR-15 5.56 NATO Take Down Upper Receiver Assembly - 16"
    Rainier Arms / Rellim Arms AR-15 5.56 NATO Take Down Upper Receiver Assembly - 16"
    $1,199.99
    Out of stock
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  10. Daniel Defense DD4 RIII Complete Upper Receiver - 16" Black
    Daniel Defense DD4 RIII Complete Upper Receiver - 16" Black
    $1,499.00
    Out of stock
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  11. 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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  12. 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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  13. Daniel Defense DD4 RIII S 5.56 Nato Complete Upper Receiver - 11.5" FDE
    Daniel Defense DD4 RIII S 5.56 Nato Complete Upper Receiver - 11.5" FDE
    $1,412.00
    Out of stock
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  14. Noveske AR-15 N4 5.56 NATO SPR Upper - 18"
    Noveske AR-15 N4 5.56 NATO SPR Upper - 18"
    $1,543.75
    Out of stock
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  15. Noveske N4 Afghan Gen 4 5.56 NATO Complete Upper - 14.5" Black
    Noveske N4 Afghan Gen 4 5.56 NATO Complete Upper - 14.5" Black
    $1,448.75
    Out of stock
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  16. Noveske GEN 4 Carry Handle Diplomat 300BLK Upper Receiver Group - 7.94"
    Noveske GEN 4 Carry Handle Diplomat 300BLK Upper Receiver Group - 7.94"
    $1,534.25
    Out of stock
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