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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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  2. Spinta Precision AR-15 300BLK Cold Hammer Forged Barrel - 8" (Limited Production)
    Spinta Precision AR-15 300BLK Cold Hammer Forged Barrel - 8" (Limited Production)
    Special Price $149.99 Regular Price $199.99
    Out of stock
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  3. Sig Sauer MCX Spear - LT 7.62X39 Complete Upper 11.5"
    Sig Sauer MCX Spear - LT 7.62X39 Complete Upper 11.5"
    $1,999.99
    Out of stock
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  4. Q LLC Cherry Bomb Muzzle Brake
    Q LLC Cherry Bomb Muzzle Brake
    Out of stock
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  5. Faxon Firearms Gunner 300BLK AR-15 QPQ Barrel - 16"
    Faxon Firearms Gunner 300BLK AR-15 QPQ Barrel - 16"
    $165.60
    Out of stock
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  6. Heresy Design AUG Barrel Conversion Kit 300BLK - 16.3"
    Heresy Design AUG Barrel Conversion Kit 300BLK - 16.3"
    $799.95
    Out of stock
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  11. Q LLC Sugar Weasel Upper 300BLK 13"
    Q LLC Sugar Weasel Upper 300BLK 13"
    $1,125.00
    Out of stock
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  12. Q LLC Flash Hider 8.6BLK - 5/8x24
    Q LLC Flash Hider 8.6BLK - 5/8x24
    $115.00
    Out of stock
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  14. Q LLC Cherry Bomb Muzzle Brake 8.6BLK - 5/8x24
    Q LLC Cherry Bomb Muzzle Brake 8.6BLK - 5/8x24
    $90.00
    Out of stock
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Items 241-256 of 258

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  1. Thread Pitch 5/8x24 (.30 cal) Remove This Item
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Barrel Length
  1. 5.5" 2 items
  2. 6" 1 item
  3. 6.5" 3 items
  4. 7" 1 item
  5. 7.5" 2 items
  6. 8" 7 items
  7. 8.3" 1 item
  8. 8.5" 3 items
  9. 9" 2 items
  10. 10" 3 items
  11. 10.3" 2 items
  12. 10.5" 7 items
  13. 10.7" 2 items
  14. 11.5" 1 item
  15. 12" 7 items
  16. 12.5" 6 items
  17. 13" 1 item
  18. 14.5" 2 items
  19. 16" 38 items
  20. 16.1" 1 item
  21. 16.3" 1 item
  22. 18" 38 items
  23. 20" 23 items
  24. 20.5" 1 item
  25. 22" 28 items
  26. 24" 4 items
  27. 26" 2 items
Barrel Profile
  1. DMR 2 items
  2. MK12 SPR 4 items
  3. Non-fluted 1 item
Caliber
  1. .223/5.56 3 items
  2. .30 Cal 5 items
  3. .308 4 items
  4. .308 Win 41 items
  5. .338 1 item
  6. .45 ACP 1 item
  7. 300 Blackout 40 items
  8. 350 Legend 2 items
  9. 5.56 NATO 4 items
  10. 6mm ARC 24 items
  11. 6.5 Creedmoor 34 items
  12. 6.5 Grendel 14 items
  13. 6.5 PRC 2 items
  14. 6MM Creedmoor 17 items
  15. 7.62mm 5 items
  16. 7.62x39 5 items
  17. 7.62x51 4 items
  18. 8.6 Blackout 6 items
  19. 9mm 1 item
Category
  1. Receiver Parts 10 items
  2. Parts & Kits 3 items
  3. Barrels 178 items
  4. Muzzle Devices 67 items
  5. MILSPEC Parts 2 items
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Configuration
  1. Gen 3 1 item
Finish
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  2. Carbon Fiber 3 items
  3. DLC 1 item
  4. Nitride 44 items
  5. Polished 36 items
  6. Satin 62 items
  7. Quench Polish Quench (QPQ) 2 items
Gas Block Diameter
  1. .750" 97 items
  2. .875" 21 items
  3. .936" 6 items
Gas System Length
  1. Pistol -1 1 item
  2. Pistol 33 items
  3. Carbine 5 items
  4. Mid 22 items
  5. Intermediate 6 items
  6. Rifle 48 items
  7. Rifle +1 3 items
  8. Rifle +2 14 items
Height
  1. Absolute Co-Witness 1 item
Manufacturer
  1. Advanced Armament Company (AAC) 4 items
  2. Aero Precision 1 item
  3. Ballistic Advantage 18 items
  4. Bootleg 1 item
  5. Boss Barrels 6 items
  6. Bravo Company MFG (BCM) 1 item
  7. Christensen Arms 3 items
  8. Cross Machine Tool (CMT) 1 item
  9. Dead Air Armament 3 items
  10. Faxon Firearms 20 items
  11. Fortis MFG 1 item
  12. Forward Controls Design 6 items
  13. Griffin Armament 1 item
  14. HERA ARMS 1 item
  15. Heresy Design 1 item
  16. HUXWRX 5 items
  17. JK Armament 2 items
  18. JMAC Customs 9 items
  19. Knight’s Armament Company (KAC) 1 item
  20. Mad Pig 2 items
  21. Maxim Defense 5 items
  22. Noveske 4 items
  23. Precision Armament 5 items
  24. Primary Weapon Systems 4 items
  25. Q, LLC 5 items
  26. Rainier Arms, LLC 126 items
  27. Rex Silentium 1 item
  28. Sharps Bros 2 items
  29. Sig Sauer 1 item
  30. Silencerco 5 items
  31. SLR Rifleworks 1 item
  32. Sons of Liberty Gun Works 1 item
  33. Spinta Precision 1 item
  34. Torrent Suppressors 1 item
  35. V Seven Weapon Systems 6 items
Mount
  1. M-LOK 2 items
  2. Picatinny 1 item
Option
  1. AR-10 5 items
  2. AR-15 3 items
Platform
  1. AR-10/LR308 57 items
  2. AR-15 75 items
  3. Remington 700 14 items
  4. Ruger Precision Rifle 12 items
  5. Savage Small Shank 15 items
  6. Sig Cross 4 items
  7. Steyr Aug 1 item
Price
  1. $0.00 - $999.99 253 items
  2. $1,000.00 and above 5 items
Product Type
  1. AR-10/LR308 Barrel 56 items
  2. AR-10 Complete Upper Receiver 1 item
  3. AR-10 Partial Upper Receiver 1 item
  4. AR-15 Barrel 75 items
  5. AR-15 Complete Upper Receiver 2 items
  6. AR-15 Partial Upper Receiver 3 items
  7. Bolt-Action Barrel 46 items
  8. Compensator 14 items
  9. Complete Upper 3 items
  10. Crush Washer 1 item
  11. Flash Hider 22 items
  12. Muzzle Brake 26 items
  13. Muzzle Device Accessory 3 items
  14. Shim Set 2 items
  15. Steyr Aug Barrel 1 item
  16. Suppressor Accessory 1 item
Rail Length
  1. 5" 1 item
  2. 7" 2 items
  3. 9.5" 1 item
  4. 12" 1 item
Threaded
  1. Yes 20 items
Twist Rate
  1. 1:3 4 items
  2. 1:5 2 items
  3. 1:6 1 item
  4. 1:7 31 items
  5. 1:7.5 26 items
  6. 1:8 70 items
  7. 1:10 48 items
Stock Status
  1. In stock 188 items
  2. Out of stock 70 items
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