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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. Knight's Armament Company (KAC) M4QD 5.56mm Flash Suppressor - 1/2x28
    Knight's Armament Company (KAC) M4QD 5.56mm Flash Suppressor - 1/2x28
    $120.06
    Out of stock
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  2. Noveske CHF Chrome Lined Lo-Pro Gas Block 5.56 NATO Barrel - 14.5"
    Noveske CHF Chrome Lined Lo-Pro Gas Block 5.56 NATO Barrel - 14.5"
    $503.50
    Out of stock
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  3. Noveske Leonidas CHF Chrome Lined 5.56 NATO FSB Barrel - 12.5"
    Noveske Leonidas CHF Chrome Lined 5.56 NATO FSB Barrel - 12.5"
    $530.00
    Out of stock
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  4. 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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  5. Milspec/GI A2 Flash Hider - 1/2x28
    Milspec/GI A2 Flash Hider - 1/2x28
    $8.00
    Out of stock
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  6. 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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  7. Noveske CHF Chrome Lined Switchblock 5.56 NATO Barrel - 10.5"
    Noveske CHF Chrome Lined Switchblock 5.56 NATO Barrel - 10.5"
    $565.25
    Out of stock
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  8. Noveske Recon Stainless Lo-Pro Gas Block Barrel 5.56 - 16"
    Noveske Recon Stainless Lo-Pro Gas Block Barrel 5.56 - 16"
    $418.00
    Out of stock
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  9. Noveske N4 Light 5.56MM Barrel - 10.5 LP
    Noveske N4 Light 5.56MM Barrel - 10.5 LP
    $427.50
    Out of stock
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  10. 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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  11. Noveske N4 Recon Gen 4 5.56 NATO Complete Upper - 16" Black
    Noveske N4 Recon Gen 4 5.56 NATO Complete Upper - 16" Black
    $1,496.25
    Out of stock
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  12. Matador Arms MAT-9 9MM Blowback Upper Receiver
    Matador Arms MAT-9 9MM Blowback Upper Receiver
    Out of stock
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  13. Sharps Bros Badlands Muzzle Brake & Blast Deflector
    Sharps Bros Badlands Muzzle Brake & Blast Deflector
    Out of stock
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  14. Primary Weapons Systems CQB Compensator
    Primary Weapons Systems CQB Compensator
    Out of stock
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  15. 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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  16. Rainier Arms UltraMatch MOD2 9mm AR-15 Barrel - 16" Polished
    Rainier Arms UltraMatch MOD2 9mm AR-15 Barrel - 16" Polished
    $209.00
    Out of stock
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Items 33-48 of 74

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Barrel Length
  1. 5.5" 1 item
  2. 6" 1 item
  3. 8.3" 2 items
  4. 8.5" 1 item
  5. 10.5" 3 items
  6. 11.5" 3 items
  7. 12" 2 items
  8. 12.5" 3 items
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  10. 13.9" 1 item
  11. 14.5" 2 items
  12. 16" 13 items
  13. 16.1" 1 item
  14. 18" 3 items
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  16. 22" 2 items
Barrel Profile
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  5. 5.56 NATO 33 items
  6. 5.56mm 1 item
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  1. .625" 1 item
  2. .750" 28 items
  3. .875" 2 items
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  11. Forward Controls Design 1 item
  12. Griffin Armament 4 items
  13. HUXWRX 2 items
  14. Icon Defense 1 item
  15. JMAC Customs 2 items
  16. Knight’s Armament Company (KAC) 3 items
  17. Matador Arms 1 item
  18. Maxim Defense 1 item
  19. Noveske 8 items
  20. Primary Weapon Systems 2 items
  21. Rainier Arms, LLC 13 items
  22. Sharps Bros 1 item
  23. Silencerco 3 items
  24. Sons of Liberty Gun Works 4 items
  25. Spinta Precision 1 item
  26. Surefire 4 items
  27. Taran Tactical Innovations 1 item
Mount
  1. M-LOK 5 items
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Platform
  1. AR-15 16 items
Price
  1. $0.00 - $999.99 67 items
  2. $1,000.00 and above 7 items
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  1. AR-15 Barrel 11 items
  2. AR-15 Complete Upper Receiver 9 items
  3. AR-15 Partial Upper Receiver 5 items
  4. AR-9 Upper Receiver 1 item
  5. Barrel 15 items
  6. Compensator 3 items
  7. Complete Upper 3 items
  8. Flash Hider 10 items
  9. Muzzle Brake 15 items
  10. Muzzle Device Accessory 2 items
Rail Length
  1. 7" 1 item
  2. 9.55" 1 item
  3. 10.7" 1 item
  4. 13" 1 item
  5. 15" 7 items
Threaded
  1. Yes 18 items
Twist Rate
  1. 1:7 19 items
  2. 1:7.5 4 items
  3. 1:8 4 items
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