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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. NorthTech Defense AR15 Billet Lower Receiver
    NorthTech Defense AR15 Billet Lower Receiver
    $199.45
    Out of stock
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  2. NorthTech Defense AR15 Billet Upper Receiver
    NorthTech Defense AR15 Billet Upper Receiver
    $237.45
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  3. Rainier Arms Forged Mil-Spec Upper Receiver
    Rainier Arms Forged Mil-Spec Upper Receiver
    $125.00
    Out of stock
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  4. VLTOR 6 Position Receiver Extension - RE-10
    VLTOR 6 Position Receiver Extension - RE-10
    $49.46
    Out of stock
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  5. Aeroknox Butterfly Brake .223/5.56
    Aeroknox Butterfly Brake .223/5.56
    $90.00
    Out of stock
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  6. Aeroknox Field Pins
    Aeroknox Field Pins
    $37.00
    Out of stock
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  7. Aero Precision AR15 Stripped Lower Receiver Gen 2 - FDE
    Aero Precision AR15 Stripped Lower Receiver Gen 2 - FDE
    $139.99
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  8. Aero Precision M4E1 AR-15 Threaded Stripped Upper Receiver - Black
    Aero Precision M4E1 AR-15 Threaded Stripped Upper Receiver - Black
    $134.99
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  9. Aero Precision 5.56 Bolt Carrier Group Complete w/ Logo - Black Nitride
    Aero Precision 5.56 Bolt Carrier Group Complete w/ Logo - Black Nitride
    $154.99
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  10. James Madison Tactical (JMT) Anti-Rotation/Anti-Walk Pins
    James Madison Tactical (JMT) Anti-Rotation/Anti-Walk Pins
    $14.95
    Out of stock
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  11. Aero Precision M5 Enhanced M-Lok Handguard Gen 2 - 15" Black
    Aero Precision M5 Enhanced M-Lok Handguard Gen 2 - 15" Black
    $199.99
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  12. Aero Precision AR15 Enhanced Carbine Buffer Tube Kit - H2
    Aero Precision AR15 Enhanced Carbine Buffer Tube Kit - H2
    $104.99
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  13. Ballistic Advantage Modern Series 5.56 Government Profile Midlength AR 15 Barrel - 14.5"
    Ballistic Advantage Modern Series 5.56 Government Profile Midlength AR 15 Barrel - 14.5"
    $161.50
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  14. Fortis MFG AR-15 REV 2.0 Free Float Rail System - FDE
    Fortis MFG AR-15 REV 2.0 Free Float Rail System - FDE
    Out of stock
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  15. Fortis MFG AR-15 REV 2.0 Free Float Rail System - OD Green
    Fortis MFG AR-15 REV 2.0 Free Float Rail System - OD Green
    Out of stock
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  16. Rainier Industries Avalanche AR-15 Ambidextrous Charging Handle Kit
    Rainier Industries Avalanche AR-15 Ambidextrous Charging Handle Kit
    $105.00
    Out of stock
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Barrel Length
  1. 16" 5 items
  2. 18" 6 items
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  2. .45 ACP 1 item
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  4. 7.62x51 1 item
Category
  1. Receiver Parts 40 items
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  1. Anti Walk Pins 2 items
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  4. AR-15 Charging Handle 8 items
  5. AR-15 Complete Lower Receiver 8 items
  6. AR-15 Partial Upper Receiver 1 item
  7. AR-15 Handguard 21 items
  8. AR-15 Receiver Set 3 items
  9. AR-15 Stripped Lower Receiver 10 items
  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
  27. Trigger 4 items
  28. Trigger Guard 1 item
  29. Upper Parts Kit 1 item
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  23. 17" 1 item
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