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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. Aero Precision AR-15 M4E1 Stripped Lower Receiver - Black
    Aero Precision AR-15 M4E1 Stripped Lower Receiver - Black
    $139.99
    Out of stock
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  2. Rainier Arms Forged Mil-Spec Upper Receiver
    Rainier Arms Forged Mil-Spec Upper Receiver
    $125.00
    Out of stock
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  3. Aeroknox AX // 15 Handguard M-LOK
    Aeroknox AX // 15 Handguard M-LOK
    Out of stock
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  6. Angstadt Arms Ultralight M-LOK Handguard
    Angstadt Arms Ultralight M-LOK Handguard
    Out of stock
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  8. Next Level Armament AR-15 M-LOK Handguard - 10.25"
    Next Level Armament AR-15 M-LOK Handguard - 10.25"
    $113.00
    Out of stock
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  10. Geissele AR-15 Super Charging Handle (SCH®)
    Geissele AR-15 Super Charging Handle (SCH®)
    Out of stock
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  11. Geissele Airborne AR-15 Charging Handle (ACH)
    Geissele Airborne AR-15 Charging Handle (ACH)
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  1. Price $100.00 - $199.99 Remove This Item
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Barrel Length
  1. 7" 1 item
  2. 18" 3 items
Caliber
  1. .45 ACP 1 item
  2. 5.56 NATO 3 items
Category
  1. Receiver Parts 31 items
  2. Parts & Kits 4 items
  3. Buffer Systems 3 items
  4. Trigger Parts 1 item
  5. Muzzle Devices 1 item
  6. Bolt Parts 9 items
  7. Charging Handles 6 items
  8. Rifle Handguards 20 items
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Configuration
  1. AR-15 3 items
  2. M-LOK 2 items
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  1. Black 1 item
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  4. Anodize 9 items
Gas System Length
  1. Pistol 1 item
  2. Intermediate 3 items
Inside Diameter
  1. 1.3" 2 items
  2. 1.315" 4 items
  3. 1.34" 1 item
  4. 1.4" 1 item
  5. 1.42" 1 item
  6. 1.54" 1 item
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  1. Aero Precision 14 items
  2. Aeroknox 1 item
  3. Andro Corp Industries 1 item
  4. Angstadt Arms 1 item
  5. Ballistic Advantage 2 items
  6. Battle Arms Development 2 items
  7. Bootleg 1 item
  8. Bravo Company MFG (BCM) 3 items
  9. Brigand Arms 1 item
  10. Centurion Arms 2 items
  11. Cross Machine Tool (CMT) 7 items
  12. F-1 Firearms 1 item
  13. Fortis MFG 4 items
  14. Forward Controls Design 4 items
  15. Geissele 2 items
  16. Griffin Armament 2 items
  17. HERA ARMS 1 item
  18. JL Billet 1 item
  19. JP Enterprises Inc 3 items
  20. Magpul Industries 1 item
  21. Midwest Industries 1 item
  22. Next Level Armament 2 items
  23. Noveske 1 item
  24. Radian Weapons 2 items
  25. Rainier Arms, LLC 2 items
  26. Rainier Industries 1 item
  27. Sharps Bros 3 items
  28. Sionics Weapon Systems 1 item
  29. Sons of Liberty Gun Works 2 items
  30. Strike Industries 1 item
  31. V Seven Weapon Systems 2 items
  32. WMD Guns 3 items
Mount
  1. M-LOK 16 items
  2. Picatinny 5 items
Platform
  1. AR-15 6 items
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  5. $140.00 - $149.99 4 items
  6. $150.00 - $159.99 6 items
  7. $160.00 - $169.99 9 items
  8. $170.00 - $179.99 7 items
  9. $180.00 - $189.99 5 items
  10. $190.00 and above 5 items
Product Type
  1. AR-10 Handguard 1 item
  2. AR-15 Assembled Upper Receiver 3 items
  3. AR-15 Charging Handle 6 items
  4. AR-15 Handguard 17 items
  5. AR-15 Stripped Lower Receiver 13 items
  6. AR-15 Stripped Upper Receiver 14 items
  7. Bolt 1 item
  8. Bolt Carrier Group 8 items
  9. Buffer Kit 1 item
  10. Buffer Spring 1 item
  11. Builders Kit 1 item
  12. Charging Handle 1 item
  13. Chassis 1 item
  14. Flash Hider 1 item
  15. Handguard 7 items
  16. Lower Parts Kit 3 items
  17. Silent Captured Spring 1 item
  18. Trigger 1 item
Rail Length
  1. 4" 1 item
  2. 4.25" 1 item
  3. 4.5" 1 item
  4. 5.5" 2 items
  5. 6.7" 6 items
  6. 7" 4 items
  7. 7.5" 2 items
  8. 8.5" 1 item
  9. 8.6" 1 item
  10. 9" 3 items
  11. 9.5" 6 items
  12. 9.6" 3 items
  13. 10.25" 1 item
  14. 10.3" 1 item
  15. 10.5" 4 items
  16. 11.5" 2 items
  17. 12" 5 items
  18. 12.3" 1 item
  19. 12.4" 3 items
  20. 12.5" 4 items
  21. 12.6" 1 item
  22. 12.8" 1 item
  23. 13" 1 item
  24. 13.5" 2 items
  25. 13.7" 4 items
  26. 13.8" 3 items
  27. 14.3" 1 item
  28. 15" 11 items
  29. 15.3" 3 items
  30. 16.3" 1 item
Size
  1. 5 Slot 1 item
  2. 9 Slot 1 item
Thread Pitch
  1. 1/2x28 (.22 cal) 1 item
  2. 5/8x24 (.30 cal) 1 item
Stock Status
  1. In stock 36 items
  2. Out of stock 39 items
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