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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. Ballistic Advantage AR-15 Enhanced Lower Receiver
    Ballistic Advantage AR-15 Enhanced Lower Receiver
    $90.24
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  2. Ballistic Advantage AR-15 Stripped Lower Receiver
    Ballistic Advantage AR-15 Stripped Lower Receiver
    $80.75
    Out of stock
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  3. Ballistic Advantage AR-15 Upper Receiver w/ Logo
    Ballistic Advantage AR-15 Upper Receiver w/ Logo
    $90.25
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  4. Ballistic Advantage AR-15 Enhanced Upper Receiver
    Ballistic Advantage AR-15 Enhanced Upper Receiver
    $113.99
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  5. Ballistic Advantage BA-10 Upper Receiver
    Ballistic Advantage BA-10 Upper Receiver
    $142.50
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  6. WMD Guns AR15 Bolt Carrier Group - NiB-X (Black)
    WMD Guns AR15 Bolt Carrier Group - NiB-X (Black)
    $190.00
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  7. Battle Arms Development RACK AR-15 Ambi Charging Handle
    Battle Arms Development RACK AR-15 Ambi Charging Handle
    Out of stock
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  8. Blackout Defense Quantum Mark 2 AR15 Stripped Upper Receiver
    Blackout Defense Quantum Mark 2 AR15 Stripped Upper Receiver
    $224.99
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  9. Radian Weapons AR-15 Raptor LT Ambidextrous Charging Handle
    Radian Weapons AR-15 Raptor LT Ambidextrous Charging Handle
    Out of stock
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  10. Blackout Defense Zero AR15 Curved Trigger (3.0 LBS)
    Blackout Defense Zero AR15 Curved Trigger (3.0 LBS)
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  11. Blackout Defense Zero AR15 Flat Trigger (3.0 LBS)
    Blackout Defense Zero AR15 Flat Trigger (3.0 LBS)
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  12. Blackout Defense Zero AR15 Flat Trigger (4.5 LBS)
    Blackout Defense Zero AR15 Flat Trigger (4.5 LBS)
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  13. WMD Guns 5.56 Accent Build Kit - FDE
    WMD Guns 5.56 Accent Build Kit - FDE
    $115.00
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  14. Sons of Liberty Gun Works Blaster Guts Lower Parts Kit - Liberty Fighting Trigger
    Sons of Liberty Gun Works Blaster Guts Lower Parts Kit - Liberty Fighting Trigger
    $120.00
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  15. Aero Precision AR-15 Carbine Buffer Kit
    Aero Precision AR-15 Carbine Buffer Kit
    $67.99
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  16. Cross Machine Tool (CMT) Tactical AR-15 UHPR MOD 2 HDX HANDGUARD
    Cross Machine Tool (CMT) Tactical AR-15 UHPR MOD 2 HDX HANDGUARD
    Out of stock
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  1. Receiver Parts 40 items
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  1. Anti Walk Pins 2 items
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  10. AR-15 Stripped Upper Receiver 12 items
  11. Barrel 1 item
  12. Bolt 1 item
  13. Bolt Carrier Group 8 items
  14. Buffer Kit 2 items
  15. Buffer Tube 1 item
  16. Builders Kit 1 item
  17. Flash Hider 1 item
  18. Forearm Accesory 1 item
  19. Grip Module 1 item
  20. Handguard 3 items
  21. Lower Parts Kit 5 items
  22. Muzzle Brake 1 item
  23. Patch 1 item
  24. Safety Selector 1 item
  25. Silent Captured Spring 1 item
  26. Take Down / Pivot Pins 2 items
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  28. Trigger Guard 1 item
  29. Upper Parts Kit 1 item
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