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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. 7.5" 2 items
  6. 8" 1 item
  7. 8.3" 1 item
  8. 8.5" 2 items
  9. 9" 1 item
  10. 10.3" 1 item
  11. 10.5" 11 items
  12. 11.5" 4 items
  13. 12" 3 items
  14. 12.5" 6 items
  15. 13.7" 3 items
  16. 13.9" 1 item
  17. 14.5" 6 items
  18. 16" 21 items
  19. 16.1" 1 item
  20. 18" 13 items
  21. 20" 6 items
  22. 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 44 items
  7. 5.56mm 1 item
  8. 6mm ARC 5 items
  9. 6.5 Grendel 1 item
  10. 9mm 9 items
Category
  1. Receiver Parts 34 items
  2. Parts & Kits 4 items
  3. Barrels 75 items
  4. Buffer Systems 1 item
  5. Trigger Parts 4 items
  6. Muzzle Devices 1 item
  7. Bolt Parts 6 items
  8. Grips 2 items
  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 23 items
  4. Phosphate 1 item
  5. Polished 3 items
  6. Satin 11 items
  7. Anodize 3 items
  8. Quench Polish Quench (QPQ) 1 item
Gas Block Diameter
  1. .625" 5 items
  2. .750" 58 items
  3. .875" 3 items
Gas System Length
  1. Blowback 8 items
  2. Pistol 7 items
  3. Carbine 16 items
  4. Mid 21 items
  5. Intermediate 4 items
  6. Rifle 15 items
  7. Rifle +1 2 items
Inside Diameter
  1. 1.3" 1 item
  2. 1.315" 1 item
Manufacturer
  1. A3 Tactical 1 item
  2. Aero Precision 7 items
  3. Angstadt Arms 1 item
  4. Ballistic Advantage 17 items
  5. Battle Arms Development 2 items
  6. Blackout Defense 1 item
  7. Bravo Company MFG (BCM) 14 items
  8. Centurion Arms 4 items
  9. Cross Machine Tool (CMT) 1 item
  10. Daniel Defense 2 items
  11. Ergo Grips 1 item
  12. Faxon Firearms 18 items
  13. Geissele 3 items
  14. Knight’s Armament Company (KAC) 1 item
  15. Lewis Machine & Tool (LMT) 8 items
  16. NEMO Arms 1 item
  17. Next Level Armament 2 items
  18. Noveske 13 items
  19. Obsidian Arms 1 item
  20. Q, LLC 2 items
  21. Radian Weapons 1 item
  22. Rainier Arms, LLC 19 items
  23. Sharps Bros 1 item
  24. Sons of Liberty Gun Works 6 items
  25. Spinta Precision 3 items
  26. Taran Tactical Innovations 1 item
  27. V Seven Weapon Systems 1 item
  28. VKTR Industries 5 items
Mount
  1. M-LOK 13 items
  2. Picatinny 2 items
Option
  1. AR-15 5 items
Product Type
  1. AR-15 Barrel 75 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 9 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 2 items
  20. Safety Selector 1 item
  21. Stock 1 item
  22. Take Down / Pivot Pins 1 item
  23. Trigger 4 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. 10.5" 1 item
  8. 11.5" 2 items
  9. 11.7" 1 item
  10. 12" 1 item
  11. 12.5" 1 item
  12. 13" 2 items
  13. 13.5" 1 item
  14. 13.7" 1 item
  15. 15" 5 items
Thread Pitch
  1. 1/2x28 (9mm) 7 items
  2. 1/2x28 (.22 cal) 54 items
  3. 1/2x36 1 item
  4. 5/8x24 (.30 cal) 15 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 52 items
  3. 1:7.5 5 items
  4. 1:8 16 items
  5. 1:10 9 items
  6. 1:14 1 item
Stock Status
  1. Out of stock 137 items Remove This Item
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