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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. Caliber 9mm Remove This Item
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Barrel Length
  1. 3.1" 1 item
  2. 4" 5 items
  3. 4.5" 2 items
  4. 5" 5 items
  5. 5.25" 1 item
  6. 5.5" 5 items
  7. 6" 5 items
  8. 7" 2 items
  9. 7.5" 4 items
  10. 8" 2 items
  11. 8.3" 1 item
  12. 10.5" 1 item
  13. 10.7" 3 items
  14. 16" 5 items
Category
  1. Receiver Parts 13 items
  2. Parts & Kits 4 items
  3. Barrels 25 items
  4. Buffer Systems 2 items
  5. Muzzle Devices 10 items
  6. Bolt Parts 4 items
  7. Grips 1 item
  8. Stocks & Braces 2 items
  9. MILSPEC Parts 1 item
Color
Configuration
  1. M-LOK 1 item
Finish
  1. Black 2 items
  2. Nickel Boron 1 item
  3. Nitride 11 items
  4. Polished 4 items
  5. Satin 5 items
  6. Titanium Nitride (TiN) 1 item
Gas System Length
  1. Blowback 24 items
  2. Pistol 2 items
Manufacturer
  1. Andro Corp Industries 1 item
  2. Angstadt Arms 3 items
  3. Battle Arms Development 2 items
  4. Boss Barrels 2 items
  5. Dead Air Armament 1 item
  6. Dead Foot Arms LLC 1 item
  7. Faxon Firearms 1 item
  8. Fortis MFG 2 items
  9. Forward Controls Design 2 items
  10. JK Armament 3 items
  11. JMAC Customs 1 item
  12. JP Enterprises Inc 1 item
  13. Kaw Valley Precision 1 item
  14. Magpul Industries 1 item
  15. Matador Arms 1 item
  16. Next Level Armament 2 items
  17. Precision Armament 1 item
  18. Q, LLC 1 item
  19. Quarter Circle 10 5 items
  20. R&D Precision 3 items
  21. Rainier Arms, LLC 16 items
  22. Shooting Innovations 2 items
  23. Spinta Precision 2 items
  24. Stern Defense 4 items
  25. Tyrant Designs 1 item
Mount
  1. M-LOK 4 items
  2. Picatinny 2 items
Option
  1. AR-9 1 item
  2. AR-15 2 items
  3. 9mm 1 item
Platform
  1. AR-15 25 items
Product Type
  1. AR-15 Barrel 25 items
  2. AR-15 Complete Upper Receiver 4 items
  3. AR-15 Receiver Set 1 item
  4. AR-9 Receiver Set 1 item
  5. AR-9 Upper Receiver 6 items
  6. Bolt Carrier Group 4 items
  7. Brace 1 item
  8. Buffer Kit 1 item
  9. Compensator 1 item
  10. Complete Upper 1 item
  11. End Cap 2 items
  12. Flash Hider 4 items
  13. Muzzle Brake 5 items
  14. Muzzle Device Accessory 1 item
  15. Parts Kit 1 item
  16. Pistol Grip 1 item
  17. Silent Captured Spring 1 item
  18. Stock 1 item
Rail Length
  1. 6.0" 2 items
  2. 12" 1 item
  3. 12.6" 2 items
  4. 15" 1 item
Size
  1. 5 Slot 2 items
Thread Pitch
  1. 1/2x28 (9mm) 28 items
  2. 1/2x28 (.22 cal) 2 items
  3. 1/2x36 5 items
  4. 5/8x24 (.30 cal) 1 item
  5. M13.5x1 LH 3 items
Threaded
  1. Yes 6 items
Twist Rate
  1. 1:10 26 items
Stock Status
  1. In stock 60 items Remove This Item
  2. Out of stock 1 item
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