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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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Barrel Length
  1. 7.5" 1 item
  2. 8" 1 item
  3. 16" 1 item
Caliber
  1. .223/5.56 1 item
  2. .223 Rem 1 item
  3. .30 Cal 2 items
  4. .308 1 item
  5. 5.56X45 1 item
  6. 5.56 NATO 2 items
  7. 5.56mm 1 item
  8. 9mm 3 items
Category
  1. Receiver Parts 3 items
  2. Parts & Kits 2 items
  3. Barrels 2 items
  4. Buffer Systems 2 items
  5. Trigger Parts 4 items
  6. Gas Systems 1 item
  7. Muzzle Devices 30 items
  8. Grips 4 items
  9. Charging Handles 12 items
  10. Rifle Handguards 1 item
  11. Stocks & Braces 8 items
Color
Configuration
  1. Curved 1 item
  2. Flat 1 item
  3. .625 DIA 1 item
Finish
  1. Nitride 1 item
Gas Block Diameter
  1. .750" 2 items
Gas System Length
  1. Pistol 1 item
  2. Mid 1 item
Inside Diameter
  1. 1.385" 1 item
Manufacturer
  1. A3 Tactical 1 item
  2. Aero Precision 1 item
  3. Airborne Arms 1 item
  4. Andro Corp Industries 1 item
  5. Angstadt Arms 1 item
  6. B5 Systems 1 item
  7. Bootleg 1 item
  8. Bravo Company MFG (BCM) 4 items
  9. Cross Machine Tool (CMT) 2 items
  10. F-1 Firearms 1 item
  11. Fortis MFG 3 items
  12. Forward Controls Design 9 items
  13. Griffin Armament 2 items
  14. Hiperfire 2 items
  15. James Madison Tactical (JMT) 2 items
  16. JK Armament 1 item
  17. JL Billet 1 item
  18. JMAC Customs 5 items
  19. Kinetic Development Group 1 item
  20. Mad Pig 2 items
  21. Magpul Industries 1 item
  22. NEMO Arms 1 item
  23. Next Level Armament 2 items
  24. Noveske 2 items
  25. Patriot Ordnance Factory (POF) 1 item
  26. Precision Armament 2 items
  27. Primary Weapon Systems 1 item
  28. Q, LLC 1 item
  29. Radian Weapons 5 items
  30. SB Tactical 4 items
  31. Silencerco 1 item
  32. Sons of Liberty Gun Works 3 items
  33. Tyrant Designs 1 item
  34. V Seven Weapon Systems 1 item
  35. WMD Guns 1 item
Mount
  1. KeyMod 1 item
  2. Picatinny 1 item
Option
  1. AK-47/74 1 item
  2. AR-10 3 items
  3. AR-15 12 items
  4. Non-Adjustable 1 item
Platform
  1. AR-15 5 items
Product Type
  1. AR-15 Barrel 2 items
  2. AR-15 Charging Handle 8 items
  3. AR-15 Complete Lower Receiver 1 item
  4. AR-15 Handguard 1 item
  5. AR-15 Stripped Lower Receiver 1 item
  6. AR-15 Stripped Upper Receiver 1 item
  7. Brace 4 items
  8. Buffer Kit 1 item
  9. Buffer Tube 1 item
  10. Charging Handle 5 items
  11. Compensator 14 items
  12. Flash Hider 7 items
  13. Gas Block 1 item
  14. Lower Parts Kit 1 item
  15. Muzzle Brake 9 items
  16. Pistol Grip 4 items
  17. Stock 3 items
  18. Stock Adapter 1 item
  19. Trigger 4 items
Rail Length
  1. 4" 1 item
  2. 7" 1 item
  3. 9.2" 1 item
  4. 10" 1 item
  5. 11.25" 1 item
  6. 13.5" 1 item
  7. 15" 1 item
Size
  1. X-Large 1 item
Thread Pitch
  1. 1/2x28 (9mm) 2 items
  2. 1/2x28 (.22 cal) 17 items
  3. 1/2x36 2 items
  4. 5/8x24 (.30 cal) 11 items
  5. M13.5x1 LH 1 item
  6. M14x1 LH 1 item
Threaded
  1. Yes 8 items
Twist Rate
  1. 1:7 2 items
Stock Status
  1. In stock 69 items Remove This Item
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