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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. Young Mfg National Match LITE Bolt Carrier Group
    Young Mfg National Match LITE Bolt Carrier Group
    $265.00
    Out of stock
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  2. VLTOR 6 Position Receiver Extension - RE-10
    VLTOR 6 Position Receiver Extension - RE-10
    $49.46
    Out of stock
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  3. VLTOR 7 Position Receiver Extension - A5
    VLTOR 7 Position Receiver Extension - A5
    $49.46
    Out of stock
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  7. Faxon Firearms PENCIL .308 Win AR-10/LR308 Barrel - 16"
    Faxon Firearms PENCIL .308 Win AR-10/LR308 Barrel - 16"
    $238.28
    Out of stock
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  13. Sons of Liberty Gun Works M4-89 5.56 AR-15 Upper - 16"
    Sons of Liberty Gun Works M4-89 5.56 AR-15 Upper - 16"
    $855.00
    Out of stock
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  16. 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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Barrel Profile
  1. Lightweight 3 items
  2. MK12 SPR 2 items
  3. Non-fluted 1 item
Caliber
  1. .223 Rem 1 item
  2. .223 Wylde 11 items
  3. .308 Win 3 items
  4. 5.56X45 1 item
  5. 5.56 NATO 34 items
  6. 6mm ARC 3 items
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Category
  1. Receiver Parts 17 items
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  3. Barrels 35 items
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  2. .750" 34 items
  3. .936" 1 item
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  1. 1.3" 1 item
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  2. AR-15 37 items
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  1. $0.00 - $999.99 62 items
  2. $1,000.00 and above 4 items
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  1. AR-10/LR308 Barrel 3 items
  2. AR-15 Barrel 32 items
  3. AR-15 Complete Upper Receiver 9 items
  4. AR-15 Partial Upper Receiver 8 items
  5. Buffer Kit 1 item
  6. Buffer Tube 3 items
  7. Flash Hider 3 items
  8. Muzzle Brake 1 item
  9. Patch 1 item
  10. Stock 2 items
Rail Length
  1. 9.5" 1 item
  2. 9.55" 1 item
  3. 10" 13 items
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  1. Small 1 item
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  1. 1/2x28 (.22 cal) 36 items
  2. 5/8x24 (.30 cal) 8 items
Threaded
  1. Yes 6 items
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  1. 1:7 24 items
  2. 1:7.5 1 item
  3. 1:8 19 items
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  1. In stock 39 items
  2. Out of stock 27 items
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