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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. Caliber 5.56 NATO Remove This Item
  2. Price $0.00 - $999.99 Remove This Item
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Barrel Length
  1. 6.75" 1 item
  2. 7" 1 item
  3. 7.5" 2 items
  4. 8" 1 item
  5. 10.3" 5 items
  6. 10.5" 20 items
  7. 11.5" 13 items
  8. 12" 2 items
  9. 12.3" 1 item
  10. 12.5" 14 items
  11. 13.7" 8 items
  12. 13.9" 3 items
  13. 14.5" 22 items
  14. 16" 33 items
  15. 16.1" 3 items
  16. 16.3" 1 item
  17. 18" 6 items
  18. 20" 4 items
Barrel Profile
  1. Dissipator 1 item
  2. Lightweight 4 items
  3. M16A1 1 item
  4. MK12 SPR 2 items
  5. Non-fluted 2 items
Category
  1. Receiver Parts 35 items
  2. Barrels 97 items
  3. Buffer Systems 1 item
  4. Gas Systems 2 items
  5. Muzzle Devices 18 items
  6. Bolt Parts 7 items
  7. Stocks & Braces 2 items
  8. MILSPEC Parts 1 item
Color
Configuration
  1. M-LOK 1 item
Finish
  1. Black 2 items
  2. Cerakote 1 item
  3. Chrome 1 item
  4. DLC 1 item
  5. Nickel Boron 1 item
  6. Nitride 29 items
  7. Phosphate 1 item
  8. Satin 4 items
  9. Anodize 1 item
  10. Titanium Nitride (TiN) 1 item
Gas Block Diameter
  1. .625" 15 items
  2. .750" 86 items
  3. .875" 1 item
Gas System Length
  1. Pistol 4 items
  2. Carbine 37 items
  3. Mid 64 items
  4. Intermediate 2 items
  5. Rifle 8 items
Height
  1. Absolute Co-Witness 1 item
Inside Diameter
  1. 1.3" 1 item
Manufacturer
  1. Aero Precision 3 items
  2. Andro Corp Industries 2 items
  3. Ballistic Advantage 14 items
  4. Bootleg 1 item
  5. Bravo Company MFG (BCM) 9 items
  6. Centurion Arms 5 items
  7. Daniel Defense 4 items
  8. Dead Air Armament 1 item
  9. Faxon Firearms 17 items
  10. Fortis MFG 2 items
  11. Geissele 4 items
  12. HB Industries 1 item
  13. Heresy Design 2 items
  14. HUXWRX 1 item
  15. Icon Defense 2 items
  16. JMAC Customs 2 items
  17. Knight’s Armament Company (KAC) 2 items
  18. Lantac 1 item
  19. Lewis Machine & Tool (LMT) 6 items
  20. Magpul Industries 2 items
  21. NEMO Arms 2 items
  22. Noveske 20 items
  23. Rainier Arms, LLC 24 items
  24. Sharps Bros 1 item
  25. Silencerco 3 items
  26. Sionics Weapon Systems 2 items
  27. Sons of Liberty Gun Works 18 items
  28. Spinta Precision 1 item
  29. Surefire 1 item
  30. Tactical Edge Arms 1 item
  31. Troy Industries 1 item
  32. VKTR Industries 3 items
Mount
  1. KeyMod 3 items
  2. M-LOK 10 items
  3. Picatinny 2 items
Option
  1. AR-15 8 items
Platform
  1. AR-15 108 items
  2. Steyr Aug 2 items
Price
  1. $0.00 - $99.99 13 items
  2. $100.00 - $199.99 56 items
  3. $200.00 - $299.99 19 items
  4. $300.00 - $399.99 19 items
  5. $400.00 - $499.99 6 items
  6. $500.00 - $599.99 18 items
  7. $600.00 - $699.99 9 items
  8. $700.00 - $799.99 15 items
  9. $800.00 - $899.99 5 items
  10. $900.00 and above 1 item
Product Type
  1. AR-15 Barrel 95 items
  2. AR-15 Complete Upper Receiver 8 items
  3. AR-15 Partial Upper Receiver 23 items
  4. AR-15 Handguard 1 item
  5. AR-15 Stripped Upper Receiver 1 item
  6. AR-15 Upper Receiver Group 1 item
  7. Bolt 1 item
  8. Bolt Carrier Group 5 items
  9. Buffer Kit 1 item
  10. Chassis 1 item
  11. Compensator 1 item
  12. Flash Hider 10 items
  13. Muzzle Brake 7 items
  14. Piston System 1 item
  15. Steyr Aug Barrel 2 items
  16. Stock 1 item
Rail Length
  1. 9" 1 item
  2. 9.2" 1 item
  3. 9.5" 2 items
  4. 9.55" 3 items
  5. 10" 4 items
  6. 10.5" 1 item
  7. 10.7" 2 items
  8. 11" 1 item
  9. 11.5" 1 item
  10. 11.7" 2 items
  11. 12" 1 item
  12. 12.5" 1 item
  13. 12.6" 1 item
  14. 13" 3 items
  15. 13.5" 1 item
  16. 13.7" 2 items
  17. 15" 9 items
  18. 16" 1 item
Size
  1. X-Large 1 item
  2. 5 Slot 1 item
  3. 9 Slot 2 items
Thread Pitch
  1. 1/2x28 (9mm) 3 items
  2. 1/2x28 (.22 cal) 124 items
  3. 5/8x24 (.30 cal) 3 items
  4. M24x1.5 RH 1 item
Threaded
  1. Yes 15 items
  2. No 1 item
Twist Rate
  1. 1:7 87 items
  2. 1:8 27 items
Stock Status
  1. In stock 95 items
  2. Out of stock 66 items
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