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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. Thread Pitch 5/8x24 (.30 cal) Remove This Item
  2. Price $0.00 - $999.99 Remove This Item
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Barrel Length
  1. 5.5" 1 item
  2. 6.5" 2 items
  3. 8" 4 items
  4. 8.5" 2 items
  5. 9" 1 item
  6. 10" 3 items
  7. 10.5" 6 items
  8. 10.7" 1 item
  9. 12" 6 items
  10. 12.5" 5 items
  11. 14.5" 2 items
  12. 16" 30 items
  13. 18" 29 items
  14. 20" 16 items
  15. 20.5" 1 item
  16. 22" 17 items
  17. 24" 3 items
  18. 26" 2 items
Barrel Profile
  1. MK12 SPR 2 items
  2. Non-fluted 1 item
Caliber
  1. .223/5.56 3 items
  2. .30 Cal 4 items
  3. .308 4 items
  4. .308 Win 29 items
  5. .45 ACP 1 item
  6. 300 Blackout 24 items
  7. 350 Legend 2 items
  8. 5.56 NATO 3 items
  9. 6mm ARC 19 items
  10. 6.5 Creedmoor 27 items
  11. 6.5 Grendel 13 items
  12. 6.5 PRC 2 items
  13. 6MM Creedmoor 6 items
  14. 7.62mm 4 items
  15. 7.62x39 3 items
  16. 7.62x51 4 items
  17. 8.6 Blackout 1 item
  18. 9mm 1 item
Category
  1. Receiver Parts 1 item
  2. Parts & Kits 3 items
  3. Barrels 129 items
  4. Muzzle Devices 53 items
  5. MILSPEC Parts 2 items
Color
Configuration
  1. Gen 3 1 item
Finish
  1. Black 2 items
  2. Carbon Fiber 3 items
  3. Nitride 37 items
  4. Polished 26 items
  5. Satin 45 items
  6. Quench Polish Quench (QPQ) 1 item
Gas Block Diameter
  1. .750" 77 items
  2. .875" 16 items
  3. .936" 5 items
Gas System Length
  1. Pistol -1 1 item
  2. Pistol 24 items
  3. Carbine 3 items
  4. Mid 17 items
  5. Intermediate 6 items
  6. Rifle 40 items
  7. Rifle +1 3 items
  8. Rifle +2 11 items
Height
  1. Absolute Co-Witness 1 item
Manufacturer
  1. Advanced Armament Company (AAC) 3 items
  2. Ballistic Advantage 9 items
  3. Boss Barrels 6 items
  4. Christensen Arms 3 items
  5. Cross Machine Tool (CMT) 1 item
  6. Dead Air Armament 3 items
  7. Faxon Firearms 12 items
  8. Fortis MFG 1 item
  9. Forward Controls Design 5 items
  10. Griffin Armament 1 item
  11. HERA ARMS 1 item
  12. HUXWRX 4 items
  13. JK Armament 2 items
  14. JMAC Customs 8 items
  15. Mad Pig 1 item
  16. Maxim Defense 2 items
  17. Noveske 4 items
  18. Precision Armament 2 items
  19. Primary Weapon Systems 4 items
  20. Q, LLC 1 item
  21. Rainier Arms, LLC 98 items
  22. Rex Silentium 1 item
  23. Sharps Bros 2 items
  24. Silencerco 3 items
  25. SLR Rifleworks 1 item
  26. Sons of Liberty Gun Works 1 item
  27. Torrent Suppressors 1 item
  28. V Seven Weapon Systems 3 items
Mount
  1. Picatinny 1 item
Option
  1. AR-10 3 items
  2. AR-15 2 items
Platform
  1. AR-10/LR308 45 items
  2. AR-15 60 items
  3. Remington 700 5 items
  4. Ruger Precision Rifle 11 items
  5. Savage Small Shank 5 items
  6. Sig Cross 4 items
Product Type
  1. AR-10/LR308 Barrel 44 items
  2. AR-15 Barrel 60 items
  3. AR-15 Partial Upper Receiver 1 item
  4. Bolt-Action Barrel 25 items
  5. Compensator 12 items
  6. Crush Washer 1 item
  7. Flash Hider 18 items
  8. Muzzle Brake 18 items
  9. Muzzle Device Accessory 3 items
  10. Shim Set 2 items
  11. Suppressor Accessory 1 item
Rail Length
  1. 7" 1 item
  2. 12" 1 item
Threaded
  1. Yes 11 items
Twist Rate
  1. 1:3 1 item
  2. 1:7 18 items
  3. 1:7.5 18 items
  4. 1:8 56 items
  5. 1:10 36 items
Stock Status
  1. In stock 186 items Remove This Item
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