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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 $0.00 - $99.99 Remove This Item
  2. Option AR-15 Remove This Item
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Barrel Length
  1. 7" 2 items
  2. 10.3" 1 item
  3. 16" 6 items
  4. 18" 4 items
Caliber
  1. .223/5.56 1 item
  2. .223 Rem 1 item
  3. 5.56 NATO 2 items
  4. 5.56mm 1 item
  5. 7.62x51 1 item
  6. 9mm 2 items
Category
  1. Receiver Parts 11 items
  2. Parts & Kits 18 items
  3. Buffer Systems 4 items
  4. Muzzle Devices 5 items
  5. Grips 1 item
  6. Charging Handles 13 items
  7. Rifle Handguards 4 items
  8. Stocks & Braces 3 items
Color
Configuration
  1. AR-10 1 item
  2. AR-15 5 items
  3. M-LOK 1 item
  4. Rifle 1 item
  5. Right Hand 1 item
Finish
  1. Black 2 items
  2. DLC 1 item
  3. Anodize 1 item
Gas System Length
  1. Pistol 2 items
  2. Mid 6 items
  3. Intermediate 4 items
Inside Diameter
  1. 1.385" 1 item
Magazine Capacity
  1. 32rd 1 item
Manufacturer
  1. Aero Precision 1 item
  2. Airborne Arms 1 item
  3. Andro Corp Industries 1 item
  4. Arms Republic 2 items
  5. Blitzkrieg Components 7 items
  6. Bootleg 1 item
  7. Bravo Company MFG (BCM) 2 items
  8. Centurion Arms 2 items
  9. Daniel Defense 1 item
  10. Fortis MFG 7 items
  11. Forward Controls Design 5 items
  12. Geissele 2 items
  13. Grey Ghost Precision 1 item
  14. Griffin Armament 2 items
  15. Half Cocked Arms (HCA) 1 item
  16. HERA ARMS 3 items
  17. Icarus Precision 1 item
  18. JL Billet 2 items
  19. JP Enterprises Inc 2 items
  20. KNS Precision 3 items
  21. Magpul Industries 3 items
  22. Next Level Armament 1 item
  23. Noveske 1 item
  24. Patriot Ordnance Factory (POF) 1 item
  25. Precision Armament 1 item
  26. Radian Weapons 2 items
  27. Rainier Industries 2 items
  28. Rise Armament 1 item
  29. Silencerco 1 item
  30. Sons of Liberty Gun Works 1 item
  31. Strike Industries 1 item
  32. Tyrant Designs 1 item
  33. Underground Tactical 1 item
  34. VLTOR 4 items
Mount
  1. KeyMod 6 items
  2. M-LOK 1 item
  3. Picatinny 9 items
Platform
  1. AR-15 4 items
Product Type
  1. AR-15 Assembled Upper Receiver 1 item
  2. AR-15 Charging Handle 11 items
  3. AR-15 Complete Lower Receiver 1 item
  4. AR-15 Handguard 2 items
  5. AR-15 Stripped Lower Receiver 3 items
  6. AR-15 Stripped Upper Receiver 6 items
  7. Bolt Catch 4 items
  8. Buffer Kit 2 items
  9. Buffer Tube 1 item
  10. Castle Nut / End Plate 2 items
  11. Charging Handle 6 items
  12. Dust Cover 3 items
  13. Flash Hider 3 items
  14. Forearm Accesory 2 items
  15. Front Sight 1 item
  16. Lower Parts Kit 4 items
  17. Magazine 1 item
  18. Muzzle Brake 2 items
  19. Pistol Grip 1 item
  20. Safety Selector 1 item
  21. Sight Post 7 items
  22. Spring 1 item
  23. Stock 2 items
  24. Stock Adapter 1 item
  25. Take Down / Pivot Pins 4 items
Rail Length
  1. 4" 1 item
  2. 7" 1 item
  3. 9" 1 item
  4. 9.2" 1 item
  5. 10" 6 items
  6. 11.25" 1 item
  7. 12" 6 items
  8. 12.6" 2 items
  9. 13.5" 1 item
  10. 15" 2 items
  11. 16.5" 1 item
Size
  1. Medium 2 items
  2. Large 2 items
  3. X-Large 2 items
  4. 5 Slot 2 items
  5. 9 Slot 6 items
Thread Pitch
  1. 1/2x28 (.22 cal) 3 items
  2. 5/8x24 (.30 cal) 1 item
Stock Status
  1. In stock 67 items Remove This Item
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