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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. 16" 1 item
  2. 18" 3 items
Caliber
  1. .223/5.56 2 items
  2. .308 1 item
  3. 9mm 1 item
Category
  1. Parts & Kits 37 items
  2. Buffer Systems 4 items
  3. Trigger Parts 6 items
  4. Gas Systems 7 items
  5. Muzzle Devices 4 items
  6. Bolt Parts 2 items
  7. Grips 20 items
  8. Charging Handles 1 item
  9. Rifle Handguards 8 items
  10. Stocks & Braces 5 items
  11. MILSPEC Parts 7 items
Color
Configuration
  1. AR-15 3 items
  2. M-LOK 1 item
  3. .625 DIA 2 items
  4. .750 DIA 3 items
  5. .875 DIA 2 items
  6. .936 DIA 1 item
Finish
  1. Black 1 item
  2. Anodize 3 items
Gas Block Diameter
  1. .750" 1 item
Gas System Length
  1. Pistol 2 items
  2. Carbine 1 item
  3. Mid 1 item
  4. Intermediate 4 items
  5. Rifle 1 item
Height
  1. Absolute Co-Witness 1 item
Manufacturer
  1. A3 Tactical 1 item
  2. Apex Tactical Specialties 1 item
  3. Arisaka 2 items
  4. Ascalon Arms 1 item
  5. B5 Systems 1 item
  6. Battle Arms Development 2 items
  7. Blitzkrieg Components 5 items
  8. Bravo Company MFG (BCM) 3 items
  9. Cross Machine Tool (CMT) 4 items
  10. Drew Meyers Defense 4 items
  11. Driven Arms Co. 2 items
  12. Eartune 1 item
  13. Ergo Grips 1 item
  14. Faxon Firearms 1 item
  15. Fortis MFG 4 items
  16. Forward Controls Design 4 items
  17. Geissele 3 items
  18. HB Industries 3 items
  19. HERA ARMS 1 item
  20. JP Enterprises Inc 2 items
  21. Knight’s Armament Company (KAC) 1 item
  22. KNS Precision 3 items
  23. Kratos Design Group 1 item
  24. Lantac 2 items
  25. LUTH-AR 1 item
  26. Mad Pig 2 items
  27. Magpul Industries 8 items
  28. Multitasker Tools 1 item
  29. Next Level Armament 1 item
  30. Noveske 1 item
  31. Patriot Ordnance Factory (POF) 1 item
  32. Precision Armament 1 item
  33. Q, LLC 4 items
  34. Rainier Arms, LLC 4 items
  35. Rainier Industries 3 items
  36. Reptilia Corp 1 item
  37. Rise Armament 1 item
  38. Stag Arms 1 item
  39. Strike Industries 4 items
  40. Tactical Edge Arms 1 item
  41. TruCalibre 2 items
  42. Tyrant Designs 1 item
  43. Unity Tactical 1 item
  44. V Seven Weapon Systems 3 items
Model
  1. CZ Scorpion 2 items
  2. Sig MPX 1 item
Mount
  1. M-LOK 11 items
  2. Other 2 items
  3. Picatinny 7 items
Option
  1. AR-10 4 items
  2. AR-15 8 items
  3. CZ 3 items
  4. Green Laser 1 item
  5. Non-Adjustable 6 items
Platform
  1. AR-15 7 items
  2. CZ 2 items
  3. Sig Sauer 1 item
Product Type
  1. Accessory 1 item
  2. Angled Grip 1 item
  3. AR-10 Handguard 1 item
  4. AR-15 Charging Handle 1 item
  5. AR-15 Handguard 1 item
  6. Bolt Catch 3 items
  7. Buffer 4 items
  8. Buffer Spring 2 items
  9. Cam Pin 3 items
  10. Castle Nut 1 item
  11. Castle Nut / End Plate 1 item
  12. Cable Clip 1 item
  13. Cheek Riser 2 items
  14. Compensator 1 item
  15. Dust Cover 1 item
  16. End Plate 3 items
  17. Finger Stop 2 items
  18. Flash Hider 1 item
  19. Forearm Accesory 3 items
  20. Forward Assist 1 item
  21. Gas Block 6 items
  22. Gas Tube 1 item
  23. Grip Accessory 1 item
  24. Handguard Adaptor 1 item
  25. Handstop 6 items
  26. Lower Parts Kit 2 items
  27. Magazine Catch 1 item
  28. Magazine Release 4 items
  29. Muzzle Device Accessory 2 items
  30. Parts Kit 4 items
  31. Pistol Grip 7 items
  32. Pistol Part 1 item
  33. Rail Panel 2 items
  34. Safety Selector 3 items
  35. Sight Post 4 items
  36. Stock 1 item
  37. Stock Accessory 1 item
  38. Stock Adapter 1 item
  39. Take Down / Pivot Pins 8 items
  40. Trigger Guard 6 items
  41. Upper Parts Kit 1 item
  42. Vertical Grip 3 items
  43. Weight 1 item
Rail Length
  1. 12" 4 items
Size
  1. 9 Slot 4 items
Thread Pitch
  1. 1/2x28 (9mm) 1 item
  2. 1/2x28 (.22 cal) 2 items
  3. 5/8x24 (.30 cal) 2 items
Stock Status
  1. In stock 102 items Remove This Item
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