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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 $20.00 - $29.99 Remove This Item
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Barrel Length
  1. 18" 3 items
Caliber
  1. .223/5.56 1 item
  2. 9mm 1 item
Category
  1. Parts & Kits 34 items
  2. Buffer Systems 4 items
  3. Trigger Parts 7 items
  4. Gas Systems 7 items
  5. Muzzle Devices 4 items
  6. Bolt Parts 2 items
  7. Grips 21 items
  8. Charging Handles 1 item
  9. Rifle Handguards 8 items
  10. Stocks & Braces 3 items
  11. MILSPEC Parts 7 items
Color
Configuration
  1. AR-15 3 items
  2. .625 DIA 2 items
  3. .750 DIA 3 items
  4. .875 DIA 2 items
  5. .936 DIA 1 item
Finish
  1. Anodize 3 items
Gas Block Diameter
  1. .750" 1 item
Gas System Length
  1. Pistol 1 item
  2. Carbine 1 item
  3. Mid 1 item
  4. Intermediate 4 items
  5. Rifle 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 4 items
  7. Blitzkrieg Components 5 items
  8. Bravo Company MFG (BCM) 3 items
  9. Cross Machine Tool (CMT) 4 items
  10. Drew Meyers Defense 3 items
  11. Driven Arms Co. 2 items
  12. Eartune 1 item
  13. Ergo Grips 1 item
  14. Faxon Firearms 1 item
  15. Fortis MFG 3 items
  16. Forward Controls Design 5 items
  17. Geissele 2 items
  18. HB Industries 3 items
  19. HUXWRX 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. Mad Pig 2 items
  26. Magpul Industries 10 items
  27. Multitasker Tools 1 item
  28. Next Level Armament 1 item
  29. Noveske 1 item
  30. Precision Armament 1 item
  31. Q, LLC 2 items
  32. Rainier Arms, LLC 4 items
  33. Rainier Industries 3 items
  34. Reptilia Corp 1 item
  35. Rise Armament 1 item
  36. Stag Arms 1 item
  37. Strike Industries 3 items
  38. Tactical Edge Arms 1 item
  39. TruCalibre 2 items
  40. Tyrant Designs 1 item
  41. Unity Tactical 1 item
  42. V Seven Weapon Systems 3 items
Model
  1. CZ Scorpion 2 items
  2. Sig MPX 1 item
Mount
  1. M-LOK 10 items
  2. Picatinny 6 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 6 items
  2. CZ 2 items
  3. Sig Sauer 1 item
Product Type
  1. Accessory 1 item
  2. Angled Grip 2 items
  3. AR-10 Handguard 1 item
  4. AR-15 Charging Handle 1 item
  5. AR-15 Handguard 1 item
  6. Bolt Catch 2 items
  7. Buffer 4 items
  8. Buffer Spring 2 items
  9. Cam Pin 2 items
  10. Castle Nut 2 items
  11. Cable Clip 1 item
  12. Cheek Riser 2 items
  13. Compensator 1 item
  14. Dust Cover 1 item
  15. End Plate 3 items
  16. Finger Stop 2 items
  17. Flash Hider 1 item
  18. Forearm Accesory 3 items
  19. Forward Assist 1 item
  20. Gas Block 6 items
  21. Gas Tube 1 item
  22. Handguard Adaptor 1 item
  23. Handstop 4 items
  24. Lower Parts Kit 2 items
  25. Magazine Catch 1 item
  26. Magazine Release 4 items
  27. Muzzle Device Accessory 2 items
  28. Parts Kit 3 items
  29. Pistol Grip 11 items
  30. Pistol Part 1 item
  31. Rail Panel 2 items
  32. Safety Selector 2 items
  33. Shim Set 1 item
  34. Sight Post 4 items
  35. Stock Accessory 1 item
  36. Take Down / Pivot Pins 8 items
  37. Trigger Guard 7 items
  38. Upper Parts Kit 1 item
  39. Vertical Grip 2 items
  40. Weight 1 item
Rail Length
  1. 12" 3 items
Size
  1. 9 Slot 3 items
Thread Pitch
  1. 1/2x28 (9mm) 1 item
  2. 1/2x28 (.22 cal) 3 items
  3. 5/8x24 (.30 cal) 3 items
Stock Status
  1. In stock 96 items Remove This Item
  2. Out of stock 3 items
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