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raineirarms

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 AR15 STRIPPED LOWER RECEIVER GEN 2 - BLACK
    Aero Precision AR15 STRIPPED LOWER RECEIVER GEN 2 - BLACK
    $119.99
    Out of stock
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  3. Aero Precision M5 (.308) ASSEMBLED UPPER RECEIVER - BLK
    Aero Precision M5 (.308) ASSEMBLED UPPER RECEIVER - BLK
    $194.99
    Out of stock
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  4. 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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  5. Aero Precision AR15 M4E1 RECEIVER SET - BLACK
    Aero Precision AR15 M4E1 RECEIVER SET - BLACK
    $269.98
    Out of stock
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  11. Aero Precision AR15 Enhanced Carbine Buffer Kit - H3
    Aero Precision AR15 Enhanced Carbine Buffer Kit - H3
    $114.99
    Out of stock
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Barrel Length
  1. 8" 1 item
  2. 16" 1 item
Caliber
  1. .308 1 item
  2. 300 Blackout 1 item
  3. 5.56 NATO 3 items
Category
  1. Receiver Parts 34 items
  2. Parts & Kits 6 items
  3. Buffer Systems 5 items
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  1. AR-10 / LR 308 Charging Handle 1 item
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  7. AR-10 Stripped Upper Receiver 2 items
  8. AR-15 Assembled Upper Receiver 1 item
  9. AR-15 Charging Handle 3 items
  10. AR-15 Complete Lower Receiver 4 items
  11. AR-15 Complete Upper Receiver 1 item
  12. AR-15 Partial Upper Receiver 1 item
  13. AR-15 Handguard 4 items
  14. AR-15 Receiver Set 2 items
  15. AR-15 Stripped Lower Receiver 10 items
  16. AR-15 Stripped Upper Receiver 4 items
  17. AR-9 Lower Receiver 2 items
  18. AR-9 Complete Lower Receiver 1 item
  19. AR-9 Receiver Set 1 item
  20. Bolt-Action Receiver 1 item
  21. Bolt Carrier Group 4 items
  22. Buffer Kit 4 items
  23. Buffer Tube 1 item
  24. Charging Handle 1 item
  25. Gas Block 3 items
  26. Lower Parts Kit 5 items
  27. Upper Parts Kit 1 item
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  1. 7" 2 items
  2. 9" 1 item
  3. 10.3" 1 item
  4. 12" 2 items
  5. 15" 8 items
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  1. 1/2x28 (.22 cal) 1 item
  2. 5/8x24 (.30 cal) 1 item
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  1. 1:7 1 item
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  2. Out of stock 54 items
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