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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. Faxon Firearms Gunner 5.56 NATO AR-15 QPQ Barrel - 20"
    Faxon Firearms Gunner 5.56 NATO AR-15 QPQ Barrel - 20"
    $188.60
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  1. Price $180.00 - $189.99 Remove This Item
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Barrel Length
  1. 10.7" 1 item
  2. 17" 1 item
  3. 20" 2 items
Caliber
  1. .308 1 item
  2. 5.56 NATO 3 items
  3. 7.62mm 1 item
  4. 9mm 2 items
Category
  1. Receiver Parts 6 items
  2. Barrels 3 items
  3. Buffer Systems 2 items
  4. Trigger Parts 3 items
  5. Gas Systems 4 items
  6. Muzzle Devices 5 items
  7. Bolt Parts 2 items
  8. Rifle Handguards 7 items
  9. Stocks & Braces 1 item
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Configuration
  1. AR-10 1 item
  2. Curved 1 item
  3. M-LOK 1 item
  4. Straight 1 item
  5. Enhanced Finger Placement (EFP) 1 item
Finish
  1. FDE 1 item
  2. Nickel Boron 1 item
  3. Nitride 2 items
  4. Phosphate 1 item
  5. Anodize 1 item
  6. PVD/CVD 1 item
Gas Block Diameter
  1. .625" 5 items
  2. .750" 5 items
  3. .875" 4 items
  4. .936" 4 items
Gas System Length
  1. Blowback 1 item
  2. Rifle 1 item
Manufacturer
  1. A3 Tactical 1 item
  2. Aero Precision 3 items
  3. Ballistic Advantage 1 item
  4. Battle Arms Development 1 item
  5. Cross Machine Tool (CMT) 2 items
  6. Faxon Firearms 1 item
  7. Fortis MFG 1 item
  8. Griffin Armament 1 item
  9. JP Enterprises Inc 2 items
  10. Knight’s Armament Company (KAC) 1 item
  11. Magpul Industries 1 item
  12. Midwest Industries 4 items
  13. Noveske 1 item
  14. Patriot Ordnance Factory (POF) 2 items
  15. Precision Armament 3 items
  16. Rainier Arms, LLC 1 item
  17. Sharps Bros 2 items
  18. Strike Industries 1 item
  19. Superlative Arms 4 items
Model
  1. CZ Scorpion 1 item
  2. Sig MCX 1 item
  3. Sig MPX 1 item
Mount
  1. M-LOK 6 items
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  1. AR-9 1 item
  2. AR-10 1 item
  3. AR-15 5 items
  4. CZ 1 item
  5. Sig Sauer 1 item
  6. Adjustable 4 items
Platform
  1. AR-10/LR308 1 item
  2. AR-15 4 items
  3. CZ 1 item
  4. Sig Sauer 2 items
Product Type
  1. AR-10 Stripped Upper Receiver 1 item
  2. AR-15 Barrel 3 items
  3. AR-15 Handguard 2 items
  4. AR-15 Stripped Lower Receiver 2 items
  5. AR-15 Stripped Upper Receiver 1 item
  6. AR-9 Lower Receiver 1 item
  7. Blast Shield 1 item
  8. Bolt Carrier Group 2 items
  9. Buffer Spring 2 items
  10. Flash Hider 1 item
  11. Gas Block 4 items
  12. Handguard 5 items
  13. Lower Receiver 1 item
  14. Muzzle Brake 3 items
  15. Stock 1 item
  16. Trigger 3 items
Rail Length
  1. 4.5" 1 item
  2. 6.25" 1 item
  3. 6.5" 1 item
  4. 7" 1 item
  5. 8" 1 item
  6. 8.25" 1 item
  7. 9" 1 item
  8. 9.5" 1 item
  9. 10" 1 item
  10. 10.5" 2 items
  11. 11.5" 1 item
  12. 12.5" 2 items
  13. 13.7" 1 item
  14. 14" 1 item
  15. 15" 3 items
  16. 17" 1 item
Thread Pitch
  1. 1/2x28 (9mm) 1 item
  2. 1/2x28 (.22 cal) 2 items
  3. 5/8x24 (.30 cal) 2 items
Twist Rate
  1. 1:7 1 item
  2. 1:8 1 item
  3. 1:10 1 item
Stock Status
  1. In stock 22 items
  2. Out of stock 11 items
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