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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. Thread Pitch 1/2x28 (.22 cal) Remove This Item
  2. Platform AR-15 Remove This Item
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Barrel Length
  1. 6.75" 1 item
  2. 7.5" 3 items
  3. 7.75" 1 item
  4. 8" 1 item
  5. 8.5" 1 item
  6. 10.3" 1 item
  7. 10.5" 16 items
  8. 11.5" 5 items
  9. 12.3" 1 item
  10. 12.5" 7 items
  11. 13.7" 5 items
  12. 13.9" 3 items
  13. 14.5" 15 items
  14. 16" 20 items
  15. 16.1" 2 items
  16. 16.25" 1 item
  17. 18" 12 items
  18. 20" 3 items
Barrel Profile
  1. Lightweight 13 items
  2. M16A1 1 item
  3. MK12 SPR 5 items
Caliber
  1. .22 ARC 1 item
  2. .223 Wylde 33 items
  3. 5.56 NATO 61 items
  4. 5.56mm 2 items
Category
  1. Receiver Parts 9 items
  2. Barrels 86 items
  3. Muzzle Devices 2 items
Color
Finish
  1. Black 1 item
  2. Carbon Fiber 2 items
  3. Nitride 29 items
  4. Polished 4 items
  5. Satin 16 items
Gas Block Diameter
  1. .625" 19 items
  2. .750" 68 items
  3. .936" 2 items
Gas System Length
  1. Pistol 6 items
  2. Carbine 23 items
  3. Mid 47 items
  4. Intermediate 1 item
  5. Rifle 15 items
Manufacturer
  1. Andro Corp Industries 1 item
  2. Ballistic Advantage 7 items
  3. Boss Barrels 2 items
  4. Bravo Company MFG (BCM) 2 items
  5. Centurion Arms 1 item
  6. Christensen Arms 2 items
  7. Daniel Defense 2 items
  8. Faxon Firearms 11 items
  9. Fightlite Industries 1 item
  10. Geissele 3 items
  11. NEMO Arms 1 item
  12. Noveske 11 items
  13. Rainier Arms, LLC 43 items
  14. Rise Armament 1 item
  15. Sons of Liberty Gun Works 9 items
Mount
  1. M-LOK 5 items
Price
  1. $0.00 - $999.99 95 items
  2. $1,000.00 - $1,999.99 1 item
  3. $3,000.00 and above 1 item
Product Type
  1. AR-15 Barrel 86 items
  2. AR-15 Complete Upper Receiver 3 items
  3. AR-15 Partial Upper Receiver 5 items
  4. AR-15 Handguard 1 item
  5. Compensator 2 items
Rail Length
  1. 9.5" 1 item
  2. 9.55" 2 items
  3. 10.7" 1 item
  4. 11.7" 1 item
  5. 13.7" 1 item
  6. 15" 3 items
  7. 15.25" 1 item
Threaded
  1. Yes 7 items
Twist Rate
  1. 1:7 50 items
  2. 1:7.5 7 items
  3. 1:8 37 items
Stock Status
  1. In stock 97 items Remove This Item
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