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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 - $999.99 Remove This Item
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Barrel Length
  1. 16" 8 items
  2. 18" 3 items
Caliber
  1. .223/5.56 1 item
  2. .45 ACP 1 item
  3. 300 Blackout 1 item
  4. 5.56 NATO 4 items
  5. 7.62x51 2 items
Category
  1. Receiver Parts 43 items
  2. Parts & Kits 14 items
  3. Buffer Systems 5 items
  4. Trigger Parts 3 items
  5. Gas Systems 1 item
  6. Muzzle Devices 3 items
  7. Bolt Parts 9 items
  8. Grips 2 items
  9. Charging Handles 9 items
  10. Rifle Handguards 24 items
  11. Stocks & Braces 2 items
Color
Configuration
  1. AR-15 5 items
  2. M-LOK 4 items
Finish
  1. Black 2 items
  2. Cerakote 1 item
  3. Chrome 1 item
  4. FDE 1 item
  5. Nitride 1 item
  6. Phosphate 1 item
  7. Anodize 13 items
Gas System Length
  1. Pistol 1 item
  2. Mid 7 items
  3. Intermediate 3 items
Inside Diameter
  1. 1.3" 1 item
  2. 1.315" 3 items
  3. 1.4" 1 item
  4. 1.42" 1 item
Manufacturer
  1. Aero Precision 20 items
  2. Aeroknox 3 items
  3. Angstadt Arms 1 item
  4. Armaspec 1 item
  5. Ballistic Advantage 5 items
  6. Battle Arms Development 7 items
  7. Blitzkrieg Components 1 item
  8. Bootleg 1 item
  9. Bravo Company MFG (BCM) 8 items
  10. Centurion Arms 1 item
  11. Cross Machine Tool (CMT) 5 items
  12. Daniel Defense 1 item
  13. Elftmann Tactical 1 item
  14. Faxon Firearms 2 items
  15. Fortis MFG 2 items
  16. Forward Controls Design 1 item
  17. Geissele 3 items
  18. HERA ARMS 3 items
  19. James Madison Tactical (JMT) 1 item
  20. JP Enterprises Inc 1 item
  21. Knight’s Armament Company (KAC) 2 items
  22. KNS Precision 1 item
  23. Lantac 3 items
  24. Magpul Industries 1 item
  25. Midwest Industries 1 item
  26. NEMO Arms 1 item
  27. Next Level Armament 2 items
  28. Noveske 3 items
  29. Patriot Ordnance Factory (POF) 1 item
  30. Precision Armament 1 item
  31. Primary Weapon Systems 1 item
  32. Radian Weapons 2 items
  33. Rainier Arms, LLC 3 items
  34. Rainier Industries 1 item
  35. Sharps Bros 1 item
  36. Silencerco 2 items
  37. Sionics Weapon Systems 3 items
  38. Sons of Liberty Gun Works 1 item
  39. Stag Arms 1 item
  40. Troy Industries 1 item
  41. Tyrant Designs 1 item
  42. V Seven Weapon Systems 4 items
  43. VLTOR 4 items
  44. WMD Guns 4 items
Mount
  1. KeyMod 7 items
  2. M-LOK 16 items
  3. Picatinny 5 items
Platform
  1. AR-15 4 items
Product Type
  1. Anti Walk Pins 2 items
  2. AR-10 Handguard 1 item
  3. AR-15 Assembled Upper Receiver 3 items
  4. AR-15 Charging Handle 8 items
  5. AR-15 Complete Lower Receiver 8 items
  6. AR-15 Handguard 21 items
  7. AR-15 Receiver Set 4 items
  8. AR-15 Stripped Lower Receiver 12 items
  9. AR-15 Stripped Upper Receiver 14 items
  10. Bolt Carrier Group 7 items
  11. Bolt Catch 1 item
  12. Buffer Kit 2 items
  13. Buffer Tube 2 items
  14. Builders Kit 1 item
  15. Charging Handle 2 items
  16. Compensator 1 item
  17. End Plate 1 item
  18. Flash Hider 1 item
  19. Forearm Accesory 1 item
  20. Grip Module 1 item
  21. Handguard 3 items
  22. Lower Parts Kit 5 items
  23. Muzzle Brake 1 item
  24. Parts Kit 1 item
  25. Patch 1 item
  26. Safety Selector 2 items
  27. Sight Post 1 item
  28. Silent Captured Spring 1 item
  29. Stock Adapter 1 item
  30. Take Down / Pivot Pins 2 items
  31. Trigger 1 item
  32. Trigger Guard 1 item
  33. Upper Parts Kit 1 item
Rail Length
  1. 4" 1 item
  2. 5.5" 1 item
  3. 6.7" 3 items
  4. 7" 4 items
  5. 9" 2 items
  6. 9.5" 3 items
  7. 9.6" 1 item
  8. 10" 7 items
  9. 10.25" 1 item
  10. 10.5" 1 item
  11. 11.1" 1 item
  12. 12" 7 items
  13. 12.25" 1 item
  14. 12.4" 1 item
  15. 12.5" 1 item
  16. 13" 3 items
  17. 13.5" 1 item
  18. 13.7" 4 items
  19. 13.8" 1 item
  20. 14" 1 item
  21. 15" 15 items
  22. 15.3" 1 item
  23. 17" 1 item
Size
  1. 9 Slot 10 items
Thread Pitch
  1. 1/2x28 (.22 cal) 2 items
  2. 5/8x24 (.30 cal) 1 item
Stock Status
  1. In stock 1 item
  2. Out of stock 115 items Remove This Item
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