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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" 1 item
  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" 11 items
  13. 11.5" 5 items
  14. 12" 3 items
  15. 12.5" 6 items
  16. 13.7" 3 items
  17. 13.9" 1 item
  18. 14.5" 6 items
  19. 16" 21 items
  20. 16.1" 1 item
  21. 18" 13 items
  22. 20" 7 items
  23. 22" 2 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 13 items
  3. .458 Socom 1 item
  4. 300 Blackout 10 items
  5. 5.56X45 4 items
  6. 5.56 NATO 45 items
  7. 5.56mm 1 item
  8. 6mm ARC 6 items
  9. 6.5 Grendel 1 item
  10. 9mm 10 items
Category
  1. Receiver Parts 33 items
  2. Parts & Kits 3 items
  3. Barrels 78 items
  4. Buffer Systems 1 item
  5. Trigger Parts 2 items
  6. Muzzle Devices 1 item
  7. Bolt Parts 6 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 22 items
  4. Phosphate 1 item
  5. Polished 3 items
  6. Satin 11 items
  7. Anodize 2 items
  8. Quench Polish Quench (QPQ) 1 item
Gas Block Diameter
  1. .625" 5 items
  2. .750" 60 items
  3. .875" 3 items
Gas System Length
  1. Blowback 9 items
  2. Pistol 7 items
  3. Carbine 17 items
  4. Mid 21 items
  5. Intermediate 4 items
  6. Rifle 16 items
  7. Rifle +1 2 items
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 17 items
  4. Battle Arms Development 2 items
  5. Bravo Company MFG (BCM) 14 items
  6. Centurion Arms 4 items
  7. Cross Machine Tool (CMT) 1 item
  8. Daniel Defense 2 items
  9. Ergo Grips 1 item
  10. Faxon Firearms 19 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. Obsidian Arms 1 item
  18. Q, LLC 2 items
  19. R&D Precision 1 item
  20. Radian Weapons 1 item
  21. Rainier Arms, LLC 17 items
  22. Sharps Bros 1 item
  23. Sons of Liberty Gun Works 6 items
  24. Spinta Precision 3 items
  25. Taran Tactical Innovations 1 item
  26. V Seven Weapon Systems 1 item
  27. 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 78 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 1 item
  12. Bolt Carrier Group 4 items
  13. Bolt Catch 1 item
  14. Buffer Spring 1 item
  15. Charging Handle 2 items
  16. Compensator 1 item
  17. Firing Pin 1 item
  18. Magazine Catch 1 item
  19. Pistol Grip 1 item
  20. Safety Selector 1 item
  21. Stock 1 item
  22. 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) 55 items
  3. 1/2x36 1 item
  4. 5/8x24 (.30 cal) 16 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 53 items
  3. 1:7.5 6 items
  4. 1:8 16 items
  5. 1:10 10 items
  6. 1:14 1 item
Stock Status
  1. In stock 2 items
  2. Out of stock 133 items Remove This Item
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