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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. Barrel Length 16" Remove This Item
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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 8 items
  3. .308 Win 11 items
  4. 300 Blackout 5 items
  5. 350 Legend 1 item
  6. 5.56X45 1 item
  7. 5.56 NATO 21 items
  8. 6mm ARC 6 items
  9. 6.5 Creedmoor 2 items
  10. 6.5 Grendel 3 items
  11. 7.62x39 2 items
  12. 7.62x51 2 items
  13. 8.6 Blackout 2 items
  14. 9mm 5 items
Category
  1. Receiver Parts 13 items
  2. Parts & Kits 1 item
  3. Barrels 56 items
  4. Buffer Systems 2 items
  5. Muzzle Devices 3 items
  6. Stocks & Braces 2 items
Color
Finish
  1. Carbon Fiber 1 item
  2. Nitride 17 items
  3. Phosphate 1 item
  4. Polished 7 items
  5. Satin 14 items
Gas Block Diameter
  1. .625" 6 items
  2. .750" 43 items
  3. .875" 1 item
  4. .936" 1 item
Gas System Length
  1. Blowback 3 items
  2. Pistol 5 items
  3. Carbine 5 items
  4. Mid 40 items
  5. Intermediate 6 items
  6. Rifle 7 items
Inside Diameter
  1. 1.3" 1 item
Manufacturer
  1. Aero Precision 1 item
  2. Angstadt Arms 1 item
  3. Ballistic Advantage 5 items
  4. Bootleg 1 item
  5. Boss Barrels 5 items
  6. Bravo Company MFG (BCM) 1 item
  7. Christensen Arms 1 item
  8. Daniel Defense 3 items
  9. Faxon Firearms 8 items
  10. Geissele 1 item
  11. Lewis Machine & Tool (LMT) 2 items
  12. Magpul Industries 2 items
  13. Noveske 1 item
  14. Precision Armament 1 item
  15. Primary Weapon Systems 1 item
  16. R&D Precision 1 item
  17. Rainier Arms, LLC 34 items
  18. Sharps Bros 1 item
  19. Sons of Liberty Gun Works 3 items
  20. VLTOR 4 items
Mount
  1. KeyMod 6 items
  2. M-LOK 3 items
  3. Picatinny 1 item
Option
  1. AR-10 1 item
  2. AR-15 6 items
Platform
  1. AR-10/LR308 11 items
  2. AR-15 43 items
  3. Ruger Precision Rifle 2 items
  4. Savage Small Shank 1 item
  5. Sig Cross 2 items
Product Type
  1. AR-10/LR308 Barrel 11 items
  2. AR-15 Barrel 40 items
  3. AR-15 Complete Upper Receiver 6 items
  4. AR-15 Partial Upper Receiver 5 items
  5. AR-15 Stripped Upper Receiver 1 item
  6. AR-9 Upper Receiver 1 item
  7. Bolt-Action Barrel 5 items
  8. Buffer Kit 1 item
  9. Buffer Tube 1 item
  10. Flash Hider 2 items
  11. Muzzle Brake 1 item
  12. Parts Kit 1 item
  13. Stock 2 items
Rail Length
  1. 9.2" 1 item
  2. 9.55" 1 item
  3. 10" 6 items
  4. 10.7" 1 item
  5. 11" 1 item
  6. 11.7" 1 item
  7. 12.5" 2 items
  8. 13.7" 1 item
  9. 14" 1 item
  10. 15" 7 items
Size
  1. Small 1 item
  2. X-Large 2 items
  3. 9 Slot 4 items
Thread Pitch
  1. 1/2x28 (9mm) 4 items
  2. 1/2x28 (.22 cal) 26 items
  3. 5/8x24 (.30 cal) 30 items
  4. M18x1.5 2 items
Threaded
  1. Yes 6 items
Twist Rate
  1. 1:3 2 items
  2. 1:7 17 items
  3. 1:7.5 7 items
  4. 1:8 19 items
  5. 1:10 18 items
Stock Status
  1. In stock 76 items Remove This Item
  2. Out of stock 1 item
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