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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. Price $90.00 - $99.99 Remove This Item
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Barrel Length
  1. 7.25" 1 item
  2. 7.5" 1 item
  3. 8" 1 item
  4. 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 4 items
Category
  1. Receiver Parts 4 items
  2. Parts & Kits 2 items
  3. Barrels 3 items
  4. Buffer Systems 2 items
  5. Trigger Parts 4 items
  6. Gas Systems 1 item
  7. Muzzle Devices 32 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
Gas Block Diameter
  1. .750" 2 items
Gas System Length
  1. Blowback 1 item
  2. Pistol 1 item
  3. Mid 1 item
Inside Diameter
  1. 1.385" 1 item
Manufacturer
  1. A3 Tactical 1 item
  2. Advanced Armament Company (AAC) 1 item
  3. Aero Precision 1 item
  4. Airborne Arms 1 item
  5. Andro Corp Industries 1 item
  6. Angstadt Arms 1 item
  7. Arms Republic 1 item
  8. B5 Systems 1 item
  9. Bootleg 1 item
  10. Bravo Company MFG (BCM) 4 items
  11. Cross Machine Tool (CMT) 2 items
  12. F-1 Firearms 1 item
  13. Fortis MFG 3 items
  14. Forward Controls Design 9 items
  15. Griffin Armament 3 items
  16. Hiperfire 2 items
  17. James Madison Tactical (JMT) 2 items
  18. JK Armament 1 item
  19. JL Billet 1 item
  20. JMAC Customs 4 items
  21. Kinetic Development Group 1 item
  22. Mad Pig 2 items
  23. Magpul Industries 1 item
  24. NEMO Arms 1 item
  25. Next Level Armament 2 items
  26. Noveske 2 items
  27. Patriot Ordnance Factory (POF) 1 item
  28. Precision Armament 2 items
  29. Primary Weapon Systems 1 item
  30. Q, LLC 2 items
  31. R&D Precision 1 item
  32. Radian Weapons 5 items
  33. SB Tactical 4 items
  34. Silencerco 1 item
  35. Sons of Liberty Gun Works 3 items
  36. Tyrant Designs 1 item
  37. V Seven Weapon Systems 1 item
  38. 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 13 items
  4. Non-Adjustable 1 item
Platform
  1. AR-15 6 items
Product Type
  1. AR-15 Barrel 3 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 2 items
  7. Brace 4 items
  8. Buffer Kit 1 item
  9. Buffer Tube 1 item
  10. Charging Handle 5 items
  11. Compensator 15 items
  12. Flash Hider 7 items
  13. Gas Block 1 item
  14. Lower Parts Kit 1 item
  15. Muzzle Brake 10 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) 3 items
  2. 1/2x28 (.22 cal) 18 items
  3. 1/2x36 2 items
  4. 5/8x24 (.30 cal) 12 items
  5. M13.5x1 LH 1 item
  6. M18x1.5 1 item
Threaded
  1. Yes 8 items
Twist Rate
  1. 1:7 2 items
  2. 1:10 1 item
Stock Status
  1. In stock 73 items Remove This Item
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