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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" 1 item
Caliber
  1. 5.56 NATO 1 item
Category
  1. Parts & Kits 18 items
  2. Trigger Parts 5 items
  3. Gas Systems 5 items
  4. Bolt Parts 2 items
  5. Grips 7 items
  6. Charging Handles 2 items
  7. Rifle Handguards 3 items
  8. Stocks & Braces 1 item
  9. MILSPEC Parts 1 item
Color
Configuration
  1. AR-15 1 item
  2. Gen 1-3 1 item
  3. GEN 2 1 item
  4. Left Hand 1 item
  5. .625 DIA 1 item
Finish
  1. Black 1 item
  2. Black Nitride 1 item
  3. Nitride 2 items
  4. Red 1 item
Gas Block Diameter
  1. .750" 2 items
  2. .875" 1 item
Gas System Length
  1. Mid 1 item
  2. Intermediate 1 item
Manufacturer
  1. A3 Tactical 2 items
  2. Accu-Tac 1 item
  3. Aero Precision 1 item
  4. Aeroknox 2 items
  5. Armaspec 2 items
  6. Arms Republic 1 item
  7. Battle Arms Development 4 items
  8. Ergo Grips 2 items
  9. Faxon Firearms 2 items
  10. Fortis MFG 1 item
  11. Forward Controls Design 3 items
  12. Griffin Armament 1 item
  13. HB Industries 1 item
  14. HERA ARMS 1 item
  15. Kinetic Development Group 1 item
  16. Knight’s Armament Company (KAC) 1 item
  17. Lantac 1 item
  18. Magpul Industries 1 item
  19. Midwest Industries 1 item
  20. Next Level Armament 1 item
  21. Q, LLC 1 item
  22. Sig Sauer 1 item
  23. SLR Rifleworks 1 item
  24. TruCalibre 1 item
  25. V Seven Weapon Systems 5 items
Model
  1. CZ Scorpion 1 item
Mount
  1. KeyMod 1 item
  2. M-LOK 3 items
  3. Picatinny 1 item
Option
  1. AR-10 1 item
  2. AR-15 4 items
  3. CZ 4 items
  4. Green Laser 1 item
  5. Non-Adjustable 3 items
Platform
  1. AR-15 4 items
  2. CZ 1 item
Product Type
  1. Angled Grip 1 item
  2. AR-15 Charging Handle 1 item
  3. Bolt Catch 4 items
  4. Buffer Tube 1 item
  5. Charging Handle 1 item
  6. Firing Pin 1 item
  7. Forward Assist 3 items
  8. Gas Block 4 items
  9. Handstop 2 items
  10. Magazine Release 2 items
  11. Pistol Grip 3 items
  12. Rail Adapter 2 items
  13. Safety Selector 5 items
  14. Stock Adapter 1 item
  15. Take Down / Pivot Pins 5 items
  16. Trigger 2 items
  17. Trigger Guard 1 item
  18. Vertical Grip 1 item
Rail Length
  1. 10" 1 item
  2. 12" 1 item
Size
  1. 3 Slot 1 item
  2. 5 Slot 1 item
  3. 9 Slot 3 items
Stock Status
  1. Out of stock 44 items Remove This Item
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