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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. Price $0.00 - $999.99 Remove This Item
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Barrel Length
  1. 4" 3 items
  2. 5" 3 items
  3. 6" 4 items
  4. 6.5" 1 item
  5. 6.75" 1 item
  6. 7.5" 1 item
  7. 7.75" 1 item
  8. 8" 4 items
  9. 8.5" 4 items
  10. 10" 2 items
  11. 10.5" 13 items
  12. 10.7" 4 items
  13. 11.5" 2 items
  14. 12" 6 items
  15. 12.5" 9 items
  16. 13.9" 2 items
  17. 14.5" 9 items
  18. 16" 33 items
  19. 18" 32 items
  20. 20" 12 items
  21. 20.5" 1 item
  22. 22" 13 items
  23. 24" 1 item
  24. 26" 2 items
Barrel Profile
  1. Lightweight 9 items
  2. M110 1 item
  3. M16A1 1 item
  4. MK12 SPR 4 items
  5. Non-fluted 1 item
Caliber
  1. .223/5.56 1 item
  2. .223 Wylde 28 items
  3. .308 Win 24 items
  4. 300 Blackout 16 items
  5. 350 Legend 2 items
  6. 5.56 NATO 16 items
  7. 6mm ARC 11 items
  8. 6.5 Creedmoor 19 items
  9. 6.5 Grendel 10 items
  10. 6.5 PRC 2 items
  11. 6MM Creedmoor 6 items
  12. 7.62x51 4 items
  13. 8.6 Blackout 3 items
  14. 9mm 15 items
Category
  1. Receiver Parts 12 items
  2. Parts & Kits 7 items
  3. Barrels 153 items
  4. Buffer Systems 1 item
  5. Trigger Parts 1 item
  6. Gas Systems 6 items
  7. Muzzle Devices 8 items
  8. Bolt Parts 2 items
  9. Charging Handles 2 items
  10. Rifle Handguards 1 item
  11. Stocks & Braces 1 item
  12. MILSPEC Parts 1 item
Color
Configuration
  1. .625 DIA 1 item
  2. .750 DIA 1 item
  3. .800 DIA 2 items
  4. .875 DIA 1 item
  5. .936 DIA 1 item
Finish
  1. Melonite 1 item
  2. Nickel Boron 1 item
  3. Nitride 60 items
  4. Polished 34 items
  5. Satin 60 items
  6. Anodize 1 item
Gas Block Diameter
  1. .625" 11 items
  2. .750" 90 items
  3. .875" 14 items
  4. .936" 4 items
Gas System Length
  1. Blowback 15 items
  2. Pistol -1 3 items
  3. Pistol 23 items
  4. Carbine 15 items
  5. Mid 29 items
  6. Intermediate 7 items
  7. Rifle 40 items
  8. Rifle +1 2 items
  9. Rifle +2 12 items
Mount
  1. M-LOK 2 items
Option
  1. AR-15 3 items
  2. WA 1 item
  3. KS 1 item
  4. Adjustable 1 item
  5. Non-Adjustable 2 items
Platform
  1. AR-10/LR308 33 items
  2. AR-15 100 items
  3. Remington 700 5 items
  4. Ruger Precision Rifle 11 items
  5. Savage Small Shank 5 items
  6. Sig Cross 4 items
Product Type
  1. AR-10/LR308 Barrel 33 items
  2. AR-15 Assembled Upper Receiver 1 item
  3. AR-15 Barrel 95 items
  4. AR-15 Complete Lower Receiver 2 items
  5. AR-15 Partial Upper Receiver 5 items
  6. AR-15 Handguard 1 item
  7. AR-15 Receiver Set 2 items
  8. AR-15 Stripped Lower Receiver 2 items
  9. Bolt-Action Barrel 25 items
  10. Bolt Carrier Group 1 item
  11. Buffer Kit 1 item
  12. Cam Pin 1 item
  13. Charging Handle 2 items
  14. Compensator 4 items
  15. End Plate 1 item
  16. Flash Hider 2 items
  17. Gas Block 2 items
  18. Gas Tube 3 items
  19. Magazine Catch 1 item
  20. Magazine Release 2 items
  21. Magwell 1 item
  22. Muzzle Brake 2 items
  23. Parts Kit 1 item
  24. Safety Selector 1 item
  25. Stock Adapter 1 item
  26. Trigger Guard 1 item
Rail Length
  1. 7" 2 items
  2. 9.5" 1 item
  3. 9.55" 3 items
  4. 10.7" 2 items
  5. 11.7" 1 item
  6. 11.75" 1 item
  7. 13.7" 2 items
  8. 15" 2 items
Thread Pitch
  1. 1/2x28 (9mm) 16 items
  2. 1/2x28 (.22 cal) 47 items
  3. 1/2x36 2 items
  4. 3/4x24 1 item
  5. 5/8x24 (.30 cal) 96 items
  6. M18x1.5 2 items
Threaded
  1. Yes 2 items
Twist Rate
  1. 1:3 3 items
  2. 1:7 20 items
  3. 1:7.5 21 items
  4. 1:8 66 items
  5. 1:10 45 items
Stock Status
  1. In stock 195 items Remove This Item
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