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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. Silencerco SCO15 Billet AR15 Upper Receiver
    Silencerco SCO15 Billet AR15 Upper Receiver
    $219.00
    Out of stock
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  2. VLTOR AR15 Charging Handle - Ambidextrous Latch
    VLTOR AR15 Charging Handle - Ambidextrous Latch
    $95.36
    Out of stock
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  11. Daniel Defense RIS II M4A1 AR15 Handguard - 12.25" FDE
    Daniel Defense RIS II M4A1 AR15 Handguard - 12.25" FDE
    $501.00
    Out of stock
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  12. Rainier Arms UltraMatch Billet Upper - MOD 3
    Rainier Arms UltraMatch Billet Upper - MOD 3
    $204.95
    Out of stock
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  13. Bravo Company MFG (BCM) Lower Group w/ Mod 0 Stock Black
    Bravo Company MFG (BCM) Lower Group w/ Mod 0 Stock Black
    $395.00
    Out of stock
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  14. Lantac UAR Upper Advanced Receiver inc CP-R360 Cam Pin
    Lantac UAR Upper Advanced Receiver inc CP-R360 Cam Pin
    $229.99
    Out of stock
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  16. Battle Arms Development AR-15 BAD556-LW Receiver Set
    Battle Arms Development AR-15 BAD556-LW Receiver Set
    $499.00
    Out of stock
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Items 33-48 of 124

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  1. Price $0.00 - $999.99 Remove This Item
  2. Option AR-15 Remove This Item
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Barrel Length
  1. 10.3" 1 item
  2. 16" 9 items
  3. 18" 3 items
Caliber
  1. .223/5.56 2 items
  2. .308 1 item
  3. .45 ACP 1 item
  4. 300 Blackout 1 item
  5. 5.56 NATO 4 items
  6. 5.56mm 1 item
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Category
  1. Receiver Parts 45 items
  2. Parts & Kits 16 items
  3. Buffer Systems 4 items
  4. Trigger Parts 6 items
  5. Gas Systems 1 item
  6. Muzzle Devices 4 items
  7. Bolt Parts 9 items
  8. Grips 2 items
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  10. Rifle Handguards 26 items
  11. Stocks & Braces 2 items
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  2. M-LOK 5 items
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  32. Rainier Arms, LLC 3 items
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  1. AR-15 5 items
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  7. $600.00 - $699.99 1 item
  8. $800.00 and above 1 item
Product Type
  1. Anti Walk Pins 2 items
  2. AR-10 Handguard 1 item
  3. AR-15 Assembled Upper Receiver 3 items
  4. AR-15 Charging Handle 6 items
  5. AR-15 Complete Lower Receiver 8 items
  6. AR-15 Partial Upper Receiver 1 item
  7. AR-15 Handguard 23 items
  8. AR-15 Receiver Set 5 items
  9. AR-15 Stripped Lower Receiver 12 items
  10. AR-15 Stripped Upper Receiver 14 items
  11. Bolt Carrier Group 7 items
  12. Bolt Catch 1 item
  13. Buffer Kit 2 items
  14. Buffer Tube 2 items
  15. Builders Kit 1 item
  16. Cam Pin 1 item
  17. Charging Handle 2 items
  18. Compensator 1 item
  19. End Plate 1 item
  20. Flash Hider 1 item
  21. Forearm Accesory 1 item
  22. Front Sight 1 item
  23. Grip Module 1 item
  24. Handguard 3 items
  25. Lower Parts Kit 5 items
  26. Muzzle Brake 2 items
  27. Parts Kit 1 item
  28. Patch 1 item
  29. Safety Selector 2 items
  30. Sight Post 1 item
  31. Stock Adapter 1 item
  32. Take Down / Pivot Pins 3 items
  33. Trigger 4 items
  34. Trigger Guard 1 item
  35. Upper Parts Kit 1 item
Rail Length
  1. 4" 1 item
  2. 5.5" 1 item
  3. 6.7" 3 items
  4. 7" 4 items
  5. 9" 2 items
  6. 9.3" 1 item
  7. 9.5" 3 items
  8. 9.6" 1 item
  9. 10" 7 items
  10. 10.25" 1 item
  11. 10.5" 2 items
  12. 11.1" 1 item
  13. 12" 10 items
  14. 12.25" 1 item
  15. 12.4" 1 item
  16. 12.5" 1 item
  17. 13" 4 items
  18. 13.5" 2 items
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  20. 13.8" 1 item
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  24. 17" 1 item
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  1. 9 Slot 11 items
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