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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. 7" 3 items
  2. 10.3" 2 items
  3. 16" 1 item
  4. 16.1" 1 item
  5. 18" 12 items
Caliber
  1. 5.56 NATO 2 items
  2. 5.56mm 1 item
  3. 9mm 3 items
Category
  1. Receiver Parts 5 items
  2. Parts & Kits 3 items
  3. Barrels 1 item
  4. Buffer Systems 2 items
  5. Muzzle Devices 2 items
  6. Bolt Parts 2 items
  7. Grips 22 items
  8. Rifle Handguards 17 items
  9. Stocks & Braces 23 items
Color
Configuration
  1. AR-15 10 items
  2. M-LOK 2 items
Finish
  1. Black 3 items
  2. Phosphate 2 items
  3. Anodize 2 items
Gas System Length
  1. Pistol 3 items
  2. Carbine 1 item
  3. Mid 1 item
  4. Intermediate 12 items
  5. Rifle 1 item
Inside Diameter
  1. 1.31" 1 item
Manufacturer
  1. A3 Tactical 13 items
  2. Arisaka 3 items
  3. Bravo Company MFG (BCM) 3 items
  4. Brigand Arms 1 item
  5. Centurion Arms 4 items
  6. Daniel Defense 2 items
  7. Drew Meyers Defense 2 items
  8. Driven Arms Co. 1 item
  9. Emissary Development 2 items
  10. Fortis MFG 1 item
  11. Forward Controls Design 2 items
  12. HB Industries 1 item
  13. HERA ARMS 2 items
  14. Heresy Design 1 item
  15. JMAC Customs 5 items
  16. JP Enterprises Inc 3 items
  17. Knight’s Armament Company (KAC) 1 item
  18. KNS Precision 1 item
  19. Lewis Machine & Tool (LMT) 2 items
  20. Magpul Industries 10 items
  21. Maxim Defense 1 item
  22. Midwest Industries 1 item
  23. Noveske 3 items
  24. Rainier Industries 1 item
  25. Rehv Arms 2 items
  26. Samson Manufacturing Corp. 2 items
  27. Sig Sauer 2 items
  28. Strike Industries 4 items
  29. True North Concepts 1 item
  30. Tyrant Designs 1 item
Model
  1. Sig MCX 2 items
  2. Sig MPX 2 items
Option
  1. AR-10 6 items
  2. AR-15 16 items
Platform
  1. AR-10/LR308 1 item
  2. AR-15 3 items
  3. Sig Sauer 2 items
  4. Steyr Aug 1 item
Product Type
  1. Angled Grip 8 items
  2. AR-10 Partial Upper Receiver 1 item
  3. AR-15 Assembled Upper Receiver 1 item
  4. AR-15 Complete Upper Receiver 1 item
  5. AR-15 Handguard 5 items
  6. Bolt 2 items
  7. Brace 3 items
  8. Buffer Tube 2 items
  9. Chassis 1 item
  10. Cheek Riser 2 items
  11. Finger Stop 1 item
  12. Flash Hider 1 item
  13. Forearm Accesory 4 items
  14. Front Sight 1 item
  15. Grip Accessory 2 items
  16. Handguard 2 items
  17. Handstop 6 items
  18. Lower Parts Kit 1 item
  19. Muzzle Brake 1 item
  20. Partial Upper Receiver 1 item
  21. Pistol Grip 2 items
  22. Rail Adapter 2 items
  23. Rail Panel 4 items
  24. Rail Section 1 item
  25. Steyr Aug Barrel 1 item
  26. Stock 12 items
  27. Stock Accessory 1 item
  28. Stock Adapter 5 items
  29. Take Down / Pivot Pins 2 items
  30. Vertical Grip 5 items
Rail Length
  1. 7.9" 1 item
  2. 9" 1 item
  3. 9.1" 1 item
  4. 9.5" 3 items
  5. 9.55" 1 item
  6. 10" 1 item
  7. 11.5" 2 items
  8. 11.75" 1 item
  9. 12" 16 items
  10. 12.55" 1 item
  11. 12.6" 3 items
  12. 12.75" 1 item
  13. 13.25" 1 item
  14. 14" 1 item
Size
  1. Small 1 item
  2. 5 Slot 3 items
  3. 9 Slot 7 items
Thread Pitch
  1. 1/2x28 (9mm) 1 item
  2. 1/2x28 (.22 cal) 2 items
  3. 5/8x24 (.30 cal) 1 item
Twist Rate
  1. 1:10 1 item
Stock Status
  1. In stock 78 items Remove This Item
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