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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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  4. Troy Industries Ambidextrous Magazine Release
    Troy Industries Ambidextrous Magazine Release
    $58.00
    Out of stock
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  5. Stag Arms A2 Pistol Grip
    Stag Arms A2 Pistol Grip
    $3.50
    Out of stock
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  6. VLTOR Flash Hider - VC:A2
    VLTOR Flash Hider - VC:A2
    $54.86
    Out of stock
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  7. Young Mfg Aluminum Railed Gas Block - .750
    Young Mfg Aluminum Railed Gas Block - .750
    $39.00
    Out of stock
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  8. Young Mfg National Match LITE Bolt Carrier Group
    Young Mfg National Match LITE Bolt Carrier Group
    $265.00
    Out of stock
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  9. VLTOR 6 Position Receiver Extension - RE-10
    VLTOR 6 Position Receiver Extension - RE-10
    $49.46
    Out of stock
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  10. VLTOR 7 Position Receiver Extension - A5
    VLTOR 7 Position Receiver Extension - A5
    $49.46
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  11. Noveske QD End Plate
    Noveske QD End Plate
    $28.50
    Out of stock
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  13. Faxon Firearms Light Tapered 9mm AR-15 Barrel - 16"
    Faxon Firearms Light Tapered 9mm AR-15 Barrel - 16"
    $133.40
    Out of stock
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Items 81-96 of 125

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  1. Barrel Length 16" Remove This Item
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Barrel Profile
  1. Dissipator 2 items
  2. Lightweight 3 items
  3. MK12 SPR 2 items
  4. Non-fluted 2 items
Caliber
  1. .22 LR 1 item
  2. .223/5.56 1 item
  3. .223 Rem 1 item
  4. .223 Wylde 15 items
  5. .308 1 item
  6. .308 Win 17 items
  7. .458 Socom 1 item
  8. 300 Blackout 7 items
  9. 350 Legend 1 item
  10. 5.56X45 2 items
  11. 5.56 NATO 37 items
  12. 6mm ARC 6 items
  13. 6.5 Creedmoor 2 items
  14. 6.5 Grendel 3 items
  15. 7.62x39 2 items
  16. 7.62x51 4 items
  17. 8.6 Blackout 4 items
  18. 9mm 10 items
Category
  1. Receiver Parts 26 items
  2. Parts & Kits 3 items
  3. Barrels 82 items
  4. Buffer Systems 4 items
  5. Gas Systems 1 item
  6. Muzzle Devices 4 items
  7. Bolt Parts 1 item
  8. Grips 1 item
  9. Stocks & Braces 3 items
Color
Configuration
  1. M-LOK 4 items
Finish
  1. Carbon Fiber 1 item
  2. Chrome 1 item
  3. Nitride 27 items
  4. Phosphate 1 item
  5. Polished 9 items
  6. Satin 18 items
  7. Anodize 1 item
Gas Block Diameter
  1. .625" 8 items
  2. .750" 60 items
  3. .875" 2 items
  4. .936" 1 item
Gas System Length
  1. Blowback 6 items
  2. Pistol 7 items
  3. Carbine 8 items
  4. Mid 66 items
  5. Intermediate 8 items
  6. Rifle 9 items
Height
  1. Absolute Co-Witness 2 items
Inside Diameter
  1. 1.3" 1 item
Manufacturer
  1. Aero Precision 1 item
  2. Angstadt Arms 2 items
  3. Ballistic Advantage 7 items
  4. Blackout Defense 1 item
  5. Bootleg 1 item
  6. Boss Barrels 5 items
  7. Bravo Company MFG (BCM) 6 items
  8. Centurion Arms 1 item
  9. Christensen Arms 1 item
  10. Daniel Defense 3 items
  11. Faxon Firearms 19 items
  12. Geissele 1 item
  13. Lewis Machine & Tool (LMT) 3 items
  14. Magpul Industries 2 items
  15. Noveske 4 items
  16. Patriot Ordnance Factory (POF) 1 item
  17. Precision Armament 1 item
  18. Primary Weapon Systems 1 item
  19. R&D Precision 1 item
  20. Rainier Arms, LLC 45 items
  21. Sharps Bros 1 item
  22. Sons of Liberty Gun Works 5 items
  23. Spinta Precision 1 item
  24. Stag Arms 1 item
  25. Troy Industries 1 item
  26. VKTR Industries 1 item
  27. VLTOR 7 items
Mount
  1. KeyMod 13 items
  2. M-LOK 7 items
  3. Picatinny 3 items
Option
  1. AR-10 1 item
  2. AR-15 15 items
Platform
  1. AR-10/LR308 14 items
  2. AR-15 64 items
  3. Remington 700 2 items
  4. Ruger 10/22 1 item
  5. Ruger Precision Rifle 2 items
  6. Savage Small Shank 3 items
  7. Sig Cross 2 items
Price
  1. $0.00 - $999.99 119 items
  2. $1,000.00 and above 6 items
Product Type
  1. 10/22 Barrel 1 item
  2. AR-10/LR308 Barrel 14 items
  3. AR-15 Barrel 57 items
  4. AR-15 Complete Upper Receiver 11 items
  5. AR-15 Partial Upper Receiver 11 items
  6. AR-15 Stripped Upper Receiver 1 item
  7. AR-9 Upper Receiver 1 item
  8. Bolt-Action Barrel 10 items
  9. Buffer Kit 1 item
  10. Buffer Tube 3 items
  11. Cam Pin 1 item
  12. Complete Upper 2 items
  13. End Plate 1 item
  14. Flash Hider 3 items
  15. Muzzle Brake 1 item
  16. Parts Kit 1 item
  17. Patch 1 item
  18. Stock 2 items
Rail Length
  1. 9.2" 1 item
  2. 9.5" 1 item
  3. 9.55" 1 item
  4. 10" 13 items
  5. 10.7" 1 item
  6. 11" 1 item
  7. 11.7" 1 item
  8. 12" 2 items
  9. 12.5" 2 items
  10. 13.7" 1 item
  11. 14" 1 item
  12. 15" 13 items
Size
  1. Small 1 item
  2. X-Large 2 items
  3. 9 Slot 13 items
Thread Pitch
  1. 1/2x28 (9mm) 6 items
  2. 1/2x28 (.22 cal) 43 items
  3. 1/2x36 1 item
  4. 5/8x24 (.30 cal) 38 items
  5. 11/16x24 1 item
  6. M18x1.5 2 items
Threaded
  1. Yes 9 items
Twist Rate
  1. 1:3 4 items
  2. 1:7 27 items
  3. 1:7.5 8 items
  4. 1:8 28 items
  5. 1:10 28 items
  6. 1:14 1 item
  7. 1:16 1 item
Stock Status
  1. In stock 76 items
  2. Out of stock 49 items
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