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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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  2. Milspec/GI A2 Flash Hider - 1/2x28
    Milspec/GI A2 Flash Hider - 1/2x28
    $8.00
    Out of stock
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  3. Lantac .223/5.56 E-BCG - TiN
    Lantac .223/5.56 E-BCG - TiN
    $305.99
    Out of stock
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  8. 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
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  9. Sons of Liberty Gun Works M4-89 5.56 AR-15 Upper - 13.7"
    Sons of Liberty Gun Works M4-89 5.56 AR-15 Upper - 13.7"
    $950.00
    Out of stock
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  11. Huxwrx Flash Hider-QD 556 Suppressor Mount - 1/2x28
    Huxwrx Flash Hider-QD 556 Suppressor Mount - 1/2x28
    $129.00
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  16. Troy Industries Battleready Series PDW Stock Kit - Full
    Troy Industries Battleready Series PDW Stock Kit - Full
    $524.00
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Items 1-16 of 75

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  1. Caliber 5.56 NATO Remove This Item
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Barrel Length
  1. 5.5" 2 items
  2. 8.5" 2 items
  3. 10.3" 1 item
  4. 10.5" 7 items
  5. 11.5" 6 items
  6. 12" 2 items
  7. 12.5" 6 items
  8. 13.7" 3 items
  9. 13.9" 1 item
  10. 14.5" 7 items
  11. 16" 17 items
  12. 16.1" 1 item
  13. 18" 4 items
  14. 20" 2 items
Barrel Profile
  1. Dissipator 1 item
  2. MK12 SPR 1 item
  3. Non-fluted 1 item
Category
  1. Receiver Parts 26 items
  2. Barrels 31 items
  3. Buffer Systems 1 item
  4. Gas Systems 2 items
  5. Muzzle Devices 8 items
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  1. .625" 3 items
  2. .750" 37 items
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  1. AR-15 4 items
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  1. AR-15 41 items
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Price
  1. $0.00 - $999.99 66 items
  2. $1,000.00 and above 9 items
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  1. AR-15 Barrel 31 items
  2. AR-15 Complete Upper Receiver 14 items
  3. AR-15 Partial Upper Receiver 11 items
  4. AR-15 Upper Receiver Group 1 item
  5. Bolt 1 item
  6. Bolt Carrier Group 5 items
  7. Buffer Kit 1 item
  8. Flash Hider 5 items
  9. Muzzle Brake 3 items
  10. Piston System 1 item
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  1. 7" 1 item
  2. 9.5" 1 item
  3. 9.55" 1 item
  4. 9.75" 1 item
  5. 10" 3 items
  6. 10.7" 1 item
  7. 11.5" 1 item
  8. 11.7" 1 item
  9. 13" 2 items
  10. 13.5" 1 item
  11. 13.7" 1 item
  12. 15" 7 items
  13. 16" 1 item
Size
  1. 9 Slot 2 items
Thread Pitch
  1. 1/2x28 (.22 cal) 50 items
  2. 5/8x24 (.30 cal) 1 item
Threaded
  1. Yes 9 items
  2. No 1 item
Twist Rate
  1. 1:7 36 items
  2. 1:8 8 items
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