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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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Items 33-48 of 75

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  1. JMAC Customs 360HD 1/2-28 FaceMount HUB
    JMAC Customs 360HD 1/2-28 FaceMount HUB
    $116.96
    Out of stock
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  2. CMMG 9MM Barrel and Bolt Carrier Group (BCG) Kit - 8"
    CMMG 9MM Barrel and Bolt Carrier Group (BCG) Kit - 8"
    Special Price $399.99 Regular Price $474.95
    Out of stock
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  3. Rainier Arms Exclusive Foxtrot Mike (FM) Products AR-15 5.56MM FM-15 Gen 2 Complete Upper Receiver - 13.9" (Rainier Arms Exclusive)
    Foxtrot Mike (FM) Products AR-15 5.56MM FM-15 Gen 2 Complete Upper Receiver - 13.9" (Rainier Arms Exclusive)
    Special Price $599.99 Regular Price $659.95
    Out of stock
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  4. Matador Arms MAT-9 9MM Blowback Upper Receiver
    Matador Arms MAT-9 9MM Blowback Upper Receiver
    Out of stock
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  5. Forward Controls Design NVTS Nautilus Variable Timing System - 1/2x28
    Forward Controls Design NVTS Nautilus Variable Timing System - 1/2x28
    $23.75
    Out of stock
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  6. Angstadt Arms 9mm 3-Lug Adapter Dual Chevron Brake - 1/2x28
    Angstadt Arms 9mm 3-Lug Adapter Dual Chevron Brake - 1/2x28
    $54.00
    Out of stock
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  7. Angstadt Arms 9mm 3-Lug Adapter A1 Style Flash Hider - 1/2x28
    Angstadt Arms 9mm 3-Lug Adapter A1 Style Flash Hider - 1/2x28
    $54.00
    Out of stock
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  8. Aeroknox Butterfly Brake .223/5.56
    Aeroknox Butterfly Brake .223/5.56
    $90.00
    Out of stock
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  9. Lantac Dragon Muzzle Brake 5.56/.223 w/ Dead Air KEYMO Suppressor Mount
    Lantac Dragon Muzzle Brake 5.56/.223 w/ Dead Air KEYMO Suppressor Mount
    $128.99
    Out of stock
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  10. Surefire SOCOM 5.56 Closed Tine Flash Hider/Adaptor - 1/2x28
    Surefire SOCOM 5.56 Closed Tine Flash Hider/Adaptor - 1/2x28
    $152.00
    Out of stock
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  11. 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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  12. 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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  13. 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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  14. Hera Arms LC-S Linear Compensator-Small
    Hera Arms LC-S Linear Compensator-Small
    $69.00
    Out of stock
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  15. Surefire PROCOMP Muzzle Brake for M4 / M16 Rifles and Variants-556
    Surefire PROCOMP Muzzle Brake for M4 / M16 Rifles and Variants-556
    $89.00
    Out of stock
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  16. Faxon Firearms GUNNER 5.56 3-Port Muzzle Brake
    Faxon Firearms GUNNER 5.56 3-Port Muzzle Brake
    $55.19
    Out of stock
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Items 33-48 of 75

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  11. Faxon Firearms 3 items
  12. Fortis MFG 1 item
  13. Forward Controls Design 1 item
  14. Foxtrot Mike 2 items
  15. Griffin Armament 2 items
  16. HERA ARMS 1 item
  17. HUXWRX 3 items
  18. Icon Defense 1 item
  19. JMAC Customs 2 items
  20. Knight’s Armament Company (KAC) 3 items
  21. Lantac 3 items
  22. Matador Arms 1 item
  23. Maxim Defense 1 item
  24. Noveske 8 items
  25. Precision Armament 2 items
  26. Primary Weapon Systems 2 items
  27. Rainier Arms, LLC 7 items
  28. Sharps Bros 1 item
  29. Silencerco 3 items
  30. Sons of Liberty Gun Works 3 items
  31. Spinta Precision 2 items
  32. Surefire 4 items
  33. Taran Tactical Innovations 1 item
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  2. AR-15 10 items
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  1. $0.00 - $999.99 68 items
  2. $1,000.00 and above 7 items
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  2. AR-15 Complete Upper Receiver 10 items
  3. AR-15 Partial Upper Receiver 5 items
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  5. Barrel 18 items
  6. Compensator 4 items
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  8. Flash Hider 8 items
  9. Muzzle Brake 21 items
  10. Muzzle Device Accessory 1 item
Rail Length
  1. 7" 1 item
  2. 9.55" 1 item
  3. 10.7" 1 item
  4. 12" 1 item
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  6. 15" 7 items
  7. 15.25" 1 item
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  1. Yes 22 items
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  1. 1:7 15 items
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