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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. Ballistic Advantage Modern Series 5.56 SPR Barrel - 18"
    Ballistic Advantage Modern Series 5.56 SPR Barrel - 18"
    $175.75
    Out of stock
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  2. Ballistic Advantage Modern Series 5.56 Government Barrel - 12.5"
    Ballistic Advantage Modern Series 5.56 Government Barrel - 12.5"
    $152.00
    Out of stock
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  3. Surefire Socom 5.56mm 4-Prong Flash Hider - 1/2x28
    Surefire Socom 5.56mm 4-Prong Flash Hider - 1/2x28
    $152.00
    Out of stock
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  4. Rainier Arms Exclusive Spinta Precision AR-15 9mm Thermal Barrel - 5.25” Nitride (Rainier Arms Exclusive)
    Spinta Precision AR-15 9mm Thermal Barrel - 5.25” Nitride (Rainier Arms Exclusive)
    Special Price $77.99 Regular Price $149.99
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  5. Rainier Arms Exclusive Spinta Precision .223 Wylde Dissipator Barrel - 16" (Rainier Arms Exclusive)
    Spinta Precision .223 Wylde Dissipator Barrel - 16" (Rainier Arms Exclusive)
    Special Price $149.99 Regular Price $199.99
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  6. Angstadt Arms 9mm AR-15 Barrel - 6"
    Angstadt Arms 9mm AR-15 Barrel - 6"
    $108.00
    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. 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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  9. Ballistic Advantage Modern Series 5.56 Goverment Barrel - 20"
    Ballistic Advantage Modern Series 5.56 Goverment Barrel - 20"
    $185.25
    Out of stock
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  10. Ballistic Advantage Modern Series 5.56 NATO Government Profile Barrel - 11.5"
    Ballistic Advantage Modern Series 5.56 NATO Government Profile Barrel - 11.5"
    $147.25
    Out of stock
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  11. Ballistic Advantage Modern Series 5.56 NATO Barrel - 10.5"
    Ballistic Advantage Modern Series 5.56 NATO Barrel - 10.5"
    $142.50
    Out of stock
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  12. Centurion Arms Lightweight Hammer Forged 5.56 Barrel - 11.5"
    Centurion Arms Lightweight Hammer Forged 5.56 Barrel - 11.5"
    $285.00
    Out of stock
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  13. Silencerco ASR .30 Caliber Muzzle Brake- 1/2x28
    Silencerco ASR .30 Caliber Muzzle Brake- 1/2x28
    $79.90
    Out of stock
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  14. Silencerco ASR Single Port Muzzle Brake 9mm Caliber - 1/2x28
    Silencerco ASR Single Port Muzzle Brake 9mm Caliber - 1/2x28
    $79.90
    Out of stock
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  15. Silencerco ASR Flash Hider .30 Caliber - 1/2x28
    Silencerco ASR Flash Hider .30 Caliber - 1/2x28
    $79.90
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  16. Knight's Armament Company (KAC) M4QD NT-4 MAMS 5.56mm Muzzle Brake - 1/2x28
    Knight's Armament Company (KAC) M4QD NT-4 MAMS 5.56mm Muzzle Brake - 1/2x28
    $237.55
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Items 1-16 of 75

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