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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. Rainier Arms Exclusive Rainier Arms / Rellim Arms AR-15 5.56 NATO Take Down Upper Receiver Assembly - 16"
    Rainier Arms / Rellim Arms AR-15 5.56 NATO Take Down Upper Receiver Assembly - 16"
    $1,199.99
    Out of stock
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  2. Sons of Liberty Gun Works M4-89 5.56 AR-15 Upper - 16"
    Sons of Liberty Gun Works M4-89 5.56 AR-15 Upper - 16"
    $855.00
    Out of stock
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  3. Sons of Liberty Gun Works M4-EXO3 5.56 AR-15 Upper - 13.7"
    Sons of Liberty Gun Works M4-EXO3 5.56 AR-15 Upper - 13.7"
    $807.50
    Out of stock
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  4. Sons of Liberty Gun Works M4-89 5.56 AR-15 Upper - 13.7"
    Sons of Liberty Gun Works M4-89 5.56 AR-15 Upper - 13.7"
    $950.00
    Out of stock
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  5. Bravo Company MFG (BCM) MK2 BFH 5.56 NATO Mid-Length Upper Receiver Group w/ MCMR-13 Handguard - 14.5"
    Bravo Company MFG (BCM) MK2 BFH 5.56 NATO Mid-Length Upper Receiver Group w/ MCMR-13 Handguard - 14.5"
    $794.99
    Out of stock
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  6. Bravo Company MFG (BCM) MK2 BFH 5.56 NATO Mid-Length Upper Receiver Group (ELW) w/ MCMR-15 Handguard - 16"
    Bravo Company MFG (BCM) MK2 BFH 5.56 NATO Mid-Length Upper Receiver Group (ELW) w/ MCMR-15 Handguard - 16"
    $805.99
    Out of stock
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  7. Faxon Firearms Gunner AR-15 5.56 NATO Barrel w/ Integral 3 Port Brake - 16"
    Faxon Firearms Gunner AR-15 5.56 NATO Barrel w/ Integral 3 Port Brake - 16"
    $239.20
    Out of stock
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  8. Faxon Firearms AR-15 .223 Wylde Pencil Barrel - 14.5"
    Faxon Firearms AR-15 .223 Wylde Pencil Barrel - 14.5"
    $211.60
    Out of stock
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  9. Bravo Company MFG (BCM) MK2 5.56 NATO Upper Receiver Group w/ MCMR-15 Handguard - 16" FDE
    Bravo Company MFG (BCM) MK2 5.56 NATO Upper Receiver Group w/ MCMR-15 Handguard - 16" FDE
    $747.39
    Out of stock
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  10. Troy Industries Ambidextrous Magazine Release
    Troy Industries Ambidextrous Magazine Release
    $58.00
    Out of stock
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  11. VLTOR Flash Hider - VC:301
    VLTOR Flash Hider - VC:301
    $59.36
    Out of stock
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  12. Young Mfg Aluminum Railed Gas Block - .750
    Young Mfg Aluminum Railed Gas Block - .750
    $39.00
    Out of stock
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  13. 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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  14. Lantac NITRIDED GAS TUBE
    Lantac NITRIDED GAS TUBE
    Out of stock
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  15. Faxon Firearms PENCIL .308 WIN, Mid-Length, 4150 QPQ Nitride - 16"
    Faxon Firearms PENCIL .308 WIN, Mid-Length, 4150 QPQ Nitride - 16"
    $238.28
    Out of stock
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  16. Faxon Firearms PENCIL .308 WIN
    Faxon Firearms PENCIL .308 WIN
    Out of stock
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Items 81-96 of 112

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  1. 7.5" 1 item
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Category
  1. Receiver Parts 26 items
  2. Parts & Kits 1 item
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  4. Rifle Barrels 48 items
  5. Buffer Systems 4 items
  6. Gas Systems 9 items
  7. Muzzle Devices 4 items
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  9. Grips 1 item
  10. Rifle Handguards 1 item
  11. Stocks & Braces 2 items
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  4. .750 DIA 12 items
Finish
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  5. Nitride 14 items
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Gas Block Diameter
  1. .625" 9 items
  2. .750" 46 items
  3. .936" 1 item
Height
  1. Absolute Co-Witness 1 item
Inside Diameter
  1. 1.3" 1 item
Is Firearms?
  1. No 112 items
Manufacturer
  1. Aero Precision 1 item
  2. Ballistic Advantage 7 items
  3. Blackout Defense 2 items
  4. Boss Barrels 3 items
  5. Bravo Company MFG (BCM) 5 items
  6. Centurion Arms 1 item
  7. Christensen Arms 2 items
  8. Daniel Defense 4 items
  9. Faxon Firearms 15 items
  10. Geissele 1 item
  11. Lantac 1 item
  12. Lewis Machine & Tool (LMT) 1 item
  13. Magpul Industries 2 items
  14. Noveske 12 items
  15. Precision Armament 1 item
  16. Primary Weapon Systems 1 item
  17. Rainier Arms, LLC 26 items
  18. Riflespeed 1 item
  19. Sharps Bros 1 item
  20. Sionics Weapon Systems 1 item
  21. Sons of Liberty Gun Works 7 items
  22. Stag Arms 1 item
  23. Superlative Arms 4 items
  24. Tactical Edge Arms 1 item
  25. Troy Industries 1 item
  26. V Seven Weapon Systems 1 item
  27. VLTOR 7 items
Mount
  1. KeyMod 14 items
  2. M-LOK 10 items
  3. Picatinny 1 item
Option
  1. AR-10 1 item
  2. AR-15 15 items
  3. Standard 1 item
  4. Non-Adjustable 3 items
Platform
  1. AR-10 2 items
  2. AR-15 33 items
Price
  1. $0.00 - $999.99 104 items
  2. $1,000.00 and above 8 items
Product Type
  1. AR-10 Barrel 2 items
  2. AR-15 Barrel 15 items
  3. AR-15 Complete Upper Receiver 14 items
  4. AR-15 Partial Upper Receiver 12 items
  5. Barrel 48 items
  6. Buffer Kit 1 item
  7. Buffer Tube 3 items
  8. Flash Hider 3 items
  9. Gas Tube 4 items
  10. Handguard 1 item
  11. Muzzle Brake 1 item
  12. Patch 1 item
  13. Piston System 4 items
  14. Stock 2 items
Rail Length
  1. 9.5" 1 item
  2. 9.55" 1 item
  3. 10" 14 items
  4. 10.7" 1 item
  5. 11.7" 1 item
  6. 12.5" 3 items
  7. 13" 2 items
  8. 13.7" 2 items
  9. 14" 1 item
  10. 15" 11 items
  11. 16" 1 item
Size
  1. 35mm rings 1 item
  2. Small 1 item
  3. X-Large 2 items
  4. 9 Slot 11 items
Thread Pitch
  1. 1/2x28 50 items
  2. 5/8x24 13 items
Threaded
  1. Yes 26 items
Twist Rate
  1. 1:7 37 items
  2. 1:7.5 2 items
  3. 1:8 23 items
  4. 1:10 2 items
Stock Status
  1. In stock 77 items
  2. Out of stock 35 items
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