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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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  3. SB Tactical FS1913 Folding Brace
    SB Tactical FS1913 Folding Brace
    $159.99
    Out of stock
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  6. Aeroknox AX // 15 Handguard M-LOK
    Aeroknox AX // 15 Handguard M-LOK
    Out of stock
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  7. Geissele Super Stabby Bayonet Mount
    Geissele Super Stabby Bayonet Mount
    Out of stock
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  8. Sons Of Liberty Gun Works L9 Receiver Extension Kit
    Sons Of Liberty Gun Works L9 Receiver Extension Kit
    $151.05
    Out of stock
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  9. Reptilia Corp RMU Picatinny Riser Mount - 12 Slot
    Reptilia Corp RMU Picatinny Riser Mount - 12 Slot
    $152.96
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Barrel Length
  1. 4" 1 item
  2. 6" 1 item
  3. 9" 1 item
  4. 10" 1 item
  5. 10.5" 3 items
  6. 11.5" 1 item
  7. 12.5" 2 items
  8. 13.9" 1 item
  9. 14.5" 1 item
  10. 18" 1 item
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  1. Lightweight 1 item
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  3. 300 Blackout 4 items
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Category
  1. Receiver Parts 4 items
  2. Barrels 12 items
  3. Buffer Systems 3 items
  4. Trigger Parts 3 items
  5. Muzzle Devices 10 items
  6. Bolt Parts 8 items
  7. Rifle Handguards 8 items
  8. Stocks & Braces 10 items
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  2. .750" 5 items
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Inside Diameter
  1. 1.42" 1 item
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  1. Aero Precision 5 items
  2. Aeroknox 1 item
  3. ALG Defense 1 item
  4. Angstadt Arms 1 item
  5. Ballistic Advantage 4 items
  6. Faxon Firearms 9 items
  7. Gear Head Works 1 item
  8. Geissele 1 item
  9. JMAC Customs 6 items
  10. JP Enterprises Inc 4 items
  11. Magpul Industries 1 item
  12. Midwest Industries 3 items
  13. Rainier Arms, LLC 3 items
  14. Reptilia Corp 1 item
  15. SB Tactical 3 items
  16. Sionics Weapon Systems 1 item
  17. Sons of Liberty Gun Works 1 item
  18. Surefire 8 items
  19. Timney Triggers 2 items
  20. V Seven Weapon Systems 2 items
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  1. AR-15 13 items
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  3. IWI 1 item
Product Type
  1. AR-10 Handguard 1 item
  2. AR-15 Assembled Upper Receiver 1 item
  3. AR-15 Barrel 12 items
  4. AR-15 Handguard 2 items
  5. AR-15 Stripped Lower Receiver 3 items
  6. AR-15 Stripped Upper Receiver 1 item
  7. Bolt 3 items
  8. Bolt Carrier Group 5 items
  9. Brace 4 items
  10. Buffer Kit 1 item
  11. Buffer Spring 1 item
  12. Buffer Tube 1 item
  13. Compensator 1 item
  14. Flash Hider 7 items
  15. Forearm Accesory 1 item
  16. Handguard 3 items
  17. Muzzle Brake 2 items
  18. Rail Adapter 1 item
  19. Stock 6 items
  20. Trigger 3 items
Rail Length
  1. 4.25" 2 items
  2. 6.25" 1 item
  3. 6.75" 1 item
  4. 9.5" 1 item
  5. 10" 1 item
  6. 10.5" 2 items
  7. 10.7" 1 item
  8. 11.5" 1 item
  9. 12" 1 item
  10. 12.5" 1 item
  11. 13" 1 item
  12. 13.7" 1 item
  13. 15" 2 items
Thread Pitch
  1. 1/2x28 (9mm) 2 items
  2. 1/2x28 (.22 cal) 8 items
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