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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. Platform AR-15 Remove This Item
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Barrel Length
  1. 5.25" 2 items
  2. 5.5" 1 item
  3. 6" 2 items
  4. 6.5" 1 item
  5. 7.25" 1 item
  6. 7.5" 2 items
  7. 8" 1 item
  8. 8.3" 1 item
  9. 8.5" 2 items
  10. 9" 1 item
  11. 10.3" 1 item
  12. 10.5" 12 items
  13. 11.5" 5 items
  14. 12" 3 items
  15. 12.5" 6 items
  16. 13.7" 4 items
  17. 13.9" 1 item
  18. 14.5" 6 items
  19. 16" 21 items
  20. 16.1" 1 item
  21. 18" 15 items
  22. 20" 7 items
  23. 22" 3 items
Barrel Profile
  1. Dissipator 2 items
  2. DMR 2 items
  3. MK12 SPR 6 items
Caliber
  1. .22 ARC 4 items
  2. .223 Wylde 14 items
  3. .458 Socom 1 item
  4. 300 Blackout 11 items
  5. 5.56X45 4 items
  6. 5.56 NATO 45 items
  7. 5.56mm 1 item
  8. 6mm ARC 8 items
  9. 6.5 Grendel 1 item
  10. 9mm 11 items
Category
  1. Receiver Parts 33 items
  2. Parts & Kits 3 items
  3. Barrels 84 items
  4. Buffer Systems 1 item
  5. Trigger Parts 2 items
  6. Muzzle Devices 1 item
  7. Bolt Parts 3 items
  8. Grips 1 item
  9. Charging Handles 3 items
  10. Rifle Handguards 6 items
  11. Stocks & Braces 1 item
Color
Finish
  1. Cerakote 3 items
  2. Melonite 1 item
  3. Nitride 25 items
  4. Phosphate 1 item
  5. Polished 3 items
  6. Satin 13 items
  7. Anodize 2 items
  8. Quench Polish Quench (QPQ) 1 item
Gas Block Diameter
  1. .625" 5 items
  2. .750" 63 items
  3. .875" 4 items
Gas System Length
  1. Blowback 10 items
  2. Pistol 8 items
  3. Carbine 17 items
  4. Mid 22 items
  5. Intermediate 4 items
  6. Rifle 17 items
  7. Rifle +1 3 items
  8. Rifle +2 1 item
Inside Diameter
  1. 1.3" 1 item
  2. 1.315" 1 item
Manufacturer
  1. Aero Precision 7 items
  2. Angstadt Arms 1 item
  3. Ballistic Advantage 18 items
  4. Battle Arms Development 3 items
  5. Bravo Company MFG (BCM) 14 items
  6. Centurion Arms 2 items
  7. Cross Machine Tool (CMT) 1 item
  8. Daniel Defense 2 items
  9. Ergo Grips 1 item
  10. Faxon Firearms 21 items
  11. Geissele 3 items
  12. Knight’s Armament Company (KAC) 1 item
  13. Lewis Machine & Tool (LMT) 8 items
  14. NEMO Arms 1 item
  15. Next Level Armament 2 items
  16. Noveske 13 items
  17. Q, LLC 2 items
  18. R&D Precision 1 item
  19. Radian Weapons 1 item
  20. Rainier Arms, LLC 19 items
  21. Sharps Bros 1 item
  22. Sons of Liberty Gun Works 6 items
  23. Spinta Precision 3 items
  24. Taran Tactical Innovations 1 item
  25. V Seven Weapon Systems 1 item
  26. VKTR Industries 5 items
Mount
  1. M-LOK 13 items
  2. Picatinny 2 items
Option
  1. AR-15 4 items
Product Type
  1. AR-15 Barrel 84 items
  2. AR-15 Charging Handle 2 items
  3. AR-15 Complete Lower Receiver 10 items
  4. AR-15 Complete Upper Receiver 4 items
  5. AR-15 Partial Upper Receiver 8 items
  6. AR-15 Handguard 6 items
  7. AR-15 Receiver Set 2 items
  8. AR-15 Stripped Lower Receiver 6 items
  9. AR-15 Stripped Upper Receiver 2 items
  10. AR-15 Upper Receiver Group 1 item
  11. Bolt Carrier Group 3 items
  12. Bolt Catch 1 item
  13. Buffer Spring 1 item
  14. Charging Handle 2 items
  15. Compensator 1 item
  16. Magazine Catch 1 item
  17. Pistol Grip 1 item
  18. Safety Selector 1 item
  19. Stock 1 item
  20. Trigger 2 items
Rail Length
  1. 7" 2 items
  2. 7.2" 1 item
  3. 9" 1 item
  4. 9.5" 1 item
  5. 9.75" 1 item
  6. 10" 1 item
  7. 11.5" 2 items
  8. 11.7" 1 item
  9. 12" 1 item
  10. 12.5" 1 item
  11. 13" 1 item
  12. 13.5" 1 item
  13. 13.7" 1 item
  14. 15" 4 items
Thread Pitch
  1. 1/2x28 (9mm) 8 items
  2. 1/2x28 (.22 cal) 57 items
  3. 1/2x36 2 items
  4. 5/8x24 (.30 cal) 19 items
  5. 11/16x24 1 item
Threaded
  1. Yes 6 items
  2. No 1 item
Twist Rate
  1. 1:5 2 items
  2. 1:7 56 items
  3. 1:7.5 6 items
  4. 1:8 18 items
  5. 1:10 11 items
  6. 1:14 1 item
Stock Status
  1. Out of stock 138 items Remove This Item
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