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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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Barrel Length
  1. 6" 1 item
  2. 10.5" 4 items
  3. 11.5" 2 items
  4. 12.5" 2 items
  5. 14.5" 4 items
  6. 16" 9 items
  7. 16.1" 2 items
  8. 20" 3 items
  9. 22" 1 item
  10. 26" 2 items
Caliber
  1. .223 Wylde 3 items
  2. .308 Win 1 item
  3. .45 ACP 1 item
  4. 5.56 NATO 12 items
  5. 5.56mm 2 items
  6. 6mm ARC 1 item
  7. 6.5 Creedmoor 4 items
  8. 6.5 Grendel 1 item
  9. 7.62x39 1 item
  10. 9mm 4 items
Category
  1. Receiver Parts 14 items
  2. Parts & Kits 1 item
  3. Barrels 20 items
  4. Muzzle Devices 1 item
  5. Bolt Parts 1 item
  6. Rifle Handguards 4 items
  7. Stocks & Braces 1 item
Color
Finish
  1. Carbon Fiber 5 items
  2. Polished 1 item
  3. Satin 2 items
Gas Block Diameter
  1. .625" 1 item
  2. .750" 11 items
  3. .875" 1 item
  4. .936" 4 items
Gas System Length
  1. Blowback 1 item
  2. Carbine 3 items
  3. Mid 12 items
  4. Intermediate 1 item
  5. Rifle 4 items
  6. Rifle +2 2 items
Inside Diameter
  1. 1.15" 1 item
  2. 1.3" 1 item
Manufacturer
  1. Aero Precision 1 item
  2. Boss Barrels 5 items
  3. Christensen Arms 5 items
  4. Daniel Defense 4 items
  5. Knight’s Armament Company (KAC) 1 item
  6. Lewis Machine & Tool (LMT) 3 items
  7. Matador Arms 1 item
  8. Maxim Defense 1 item
  9. Noveske 7 items
  10. Primary Weapon Systems 1 item
  11. R&D Precision 1 item
  12. Rainier Arms, LLC 4 items
  13. RogueOps 1 item
  14. Sons of Liberty Gun Works 1 item
  15. Stern Defense 2 items
  16. Tactical Edge Arms 1 item
  17. V Seven Weapon Systems 1 item
  18. WOOX 2 items
Mount
  1. M-LOK 5 items
Option
  1. AR-15 2 items
  2. Remington 700 Short Action 1 item
  3. Remington 700 Short Action BDL 1 item
Platform
  1. AR-10/LR308 6 items
  2. AR-15 22 items
Product Type
  1. AR-10/LR308 Barrel 5 items
  2. AR-10 Stripped Lower Receiver 1 item
  3. AR-15 Barrel 15 items
  4. AR-15 Complete Lower Receiver 1 item
  5. AR-15 Complete Upper Receiver 1 item
  6. AR-15 Partial Upper Receiver 3 items
  7. AR-15 Handguard 4 items
  8. AR-15 Receiver Set 3 items
  9. AR-9 Upper Receiver 2 items
  10. Bolt Carrier Group 1 item
  11. Chassis 2 items
  12. Compensator 1 item
  13. Complete Upper 1 item
Rail Length
  1. 6.0" 1 item
  2. 8" 1 item
  3. 9.5" 1 item
  4. 9.55" 3 items
  5. 10.7" 1 item
  6. 11.7" 1 item
  7. 12" 1 item
  8. 12.5" 1 item
  9. 13" 1 item
  10. 13.7" 1 item
  11. 15" 2 items
Thread Pitch
  1. 1/2x28 (9mm) 2 items
  2. 1/2x28 (.22 cal) 14 items
  3. 5/8x24 (.30 cal) 8 items
Threaded
  1. Yes 3 items
Twist Rate
  1. 1:7 9 items
  2. 1:7.5 1 item
  3. 1:8 8 items
  4. 1:10 4 items
Stock Status
  1. In stock 42 items Remove This Item
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