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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. Manufacturer Fortis MFG Remove This Item
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Barrel Length
  1. 10.3" 1 item
Caliber
  1. 5.56 NATO 2 items
  2. 5.56mm 2 items
  3. 7.62mm 1 item
  4. 9mm 2 items
Category
  1. Receiver Parts 4 items
  2. Parts & Kits 12 items
  3. Gas Systems 2 items
  4. Muzzle Devices 8 items
  5. Bolt Parts 1 item
  6. Grips 12 items
  7. Charging Handles 4 items
  8. Rifle Handguards 7 items
  9. Stocks & Braces 1 item
Color
Configuration
  1. AR-15 1 item
  2. Right Hand 1 item
Finish
  1. Bead Blast Stainless Steel 1 item
  2. Case Hardened 1 item
  3. Nitride 2 items
  4. Phosphate 1 item
  5. Anodize 13 items
Gas Block Diameter
  1. .750" 1 item
Inside Diameter
  1. 1.34" 3 items
Model
  1. Sig MCX 1 item
Mount
  1. M-LOK 7 items
  2. Picatinny 1 item
Option
  1. AR-10 2 items
  2. AR-15 16 items
  3. 9mm 1 item
  4. Non-Adjustable 2 items
Platform
  1. AR-10/LR308 2 items
  2. AR-15 2 items
  3. Sig Sauer 1 item
Price
  1. $0.00 - $99.99 32 items
  2. $100.00 - $199.99 10 items
  3. $200.00 - $299.99 7 items
  4. $300.00 and above 2 items
Product Type
  1. Angled Grip 2 items
  2. AR-10 / LR 308 Charging Handle 1 item
  3. AR-10 Handguard 1 item
  4. AR-15 Charging Handle 2 items
  5. AR-15 Handguard 6 items
  6. AR-15 Receiver Set 1 item
  7. AR-15 Stripped Lower Receiver 2 items
  8. AR-15 Stripped Upper Receiver 1 item
  9. Blast Shield 1 item
  10. Bolt Carrier Group 1 item
  11. Castle Nut / End Plate 2 items
  12. Charging Handle 2 items
  13. Dust Cover 2 items
  14. Gas Block 2 items
  15. Handstop 2 items
  16. Lower Parts Kit 1 item
  17. Magazine Button 1 item
  18. Magazine Catch 1 item
  19. Magazine Release 1 item
  20. Muzzle Brake 6 items
  21. Muzzle Device Accessory 1 item
  22. Parts Kit 1 item
  23. Pistol Grip 8 items
  24. Safety Selector 2 items
  25. Stock 1 item
  26. Take Down / Pivot Pins 1 item
Rail Length
  1. 6.7" 4 items
  2. 9.6" 5 items
  3. 11.8" 3 items
  4. 12" 1 item
  5. 12.4" 2 items
  6. 13" 1 item
  7. 13.8" 5 items
  8. 15" 1 item
  9. 15.3" 5 items
  10. 17" 1 item
Thread Pitch
  1. 1/2x28 (9mm) 1 item
  2. 1/2x28 (.22 cal) 3 items
  3. 1/2x36 2 items
  4. 5/8x24 (.30 cal) 1 item
Threaded
  1. Yes 1 item
Stock Status
  1. In stock 50 items Remove This Item
  2. Out of stock 1 item
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