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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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Items 17-32 of 116

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  3. Aero Precision Upper Parts Kit
    Aero Precision Upper Parts Kit
    Out of stock
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  6. Aero Precision AR15 Atlas S-One Handguard 15" - FDE
    Aero Precision AR15 Atlas S-One Handguard 15" - FDE
    $219.99
    Out of stock
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  8. Bravo Company MFG QRF Quad Rail Handguard - 7"
    Bravo Company MFG QRF Quad Rail Handguard - 7"
    $206.95
    Out of stock
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  9. KNS Precision AR15 AR/MCX Stock Adapter With Flange
    KNS Precision AR15 AR/MCX Stock Adapter With Flange
    $51.00
    Out of stock
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  11. Jacob Grey JG15 AR-15 Stripped Billet Lower Receiver
    Jacob Grey JG15 AR-15 Stripped Billet Lower Receiver
    Special Price $139.92 Regular Price $218.00
    Out of stock
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  13. WMD Guns AR15 Bolt Carrier Group - NiB-X
    WMD Guns AR15 Bolt Carrier Group - NiB-X
    $164.00
    Out of stock
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  14. Silencerco SCO15 Billet AR15 Lower Receiver
    Silencerco SCO15 Billet AR15 Lower Receiver
    $269.00
    Out of stock
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  15. Silencerco SCO15 Billet AR15 Upper Receiver
    Silencerco SCO15 Billet AR15 Upper Receiver
    $219.00
    Out of stock
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  16. VLTOR AR15 Charging Handle - Ambidextrous Latch
    VLTOR AR15 Charging Handle - Ambidextrous Latch
    $95.36
    Out of stock
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Items 17-32 of 116

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  1. Option AR-15 Remove This Item
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Barrel Length
  1. 8.5" 1 item
  2. 16" 9 items
  3. 18" 3 items
Caliber
  1. .223/5.56 3 items
  2. .308 1 item
  3. .45 ACP 1 item
  4. 300 Blackout 1 item
  5. 5.56 NATO 4 items
  6. 7.62x51 2 items
Category
  1. Receiver Parts 44 items
  2. Parts & Kits 15 items
  3. Buffer Systems 4 items
  4. Trigger Parts 3 items
  5. Gas Systems 1 item
  6. Muzzle Devices 3 items
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  11. Stocks & Braces 2 items
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  3. 1.4" 1 item
  4. 1.42" 1 item
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  30. Patriot Ordnance Factory (POF) 2 items
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  32. Primary Weapon Systems 1 item
  33. Rainier Arms, LLC 3 items
  34. Rainier Industries 1 item
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  36. Silencerco 2 items
  37. Sionics Weapon Systems 3 items
  38. Sons of Liberty Gun Works 1 item
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  42. V Seven Weapon Systems 4 items
  43. VLTOR 4 items
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Mount
  1. KeyMod 7 items
  2. M-LOK 17 items
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Platform
  1. AR-15 4 items
Price
  1. $0.00 - $999.99 115 items
  2. $1,000.00 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 Complete Upper Receiver 1 item
  7. AR-15 Handguard 22 items
  8. AR-15 Receiver Set 4 items
  9. AR-15 Stripped Lower Receiver 13 items
  10. AR-15 Stripped Upper Receiver 13 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. Grip Module 1 item
  23. Handguard 3 items
  24. Lower Parts Kit 5 items
  25. Muzzle Brake 1 item
  26. Parts Kit 1 item
  27. Patch 1 item
  28. Safety Selector 2 items
  29. Sight Post 1 item
  30. Stock Adapter 1 item
  31. Take Down / Pivot Pins 2 items
  32. Trigger 1 item
  33. Trigger Guard 1 item
  34. 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. 9.5" 3 items
  7. 9.6" 1 item
  8. 10" 7 items
  9. 10.25" 1 item
  10. 10.5" 1 item
  11. 11.1" 1 item
  12. 12" 8 items
  13. 12.25" 1 item
  14. 12.4" 1 item
  15. 12.5" 1 item
  16. 13" 3 items
  17. 13.5" 1 item
  18. 13.7" 4 items
  19. 13.8" 1 item
  20. 14" 1 item
  21. 15" 15 items
  22. 15.3" 1 item
  23. 17" 1 item
Size
  1. 9 Slot 11 items
Thread Pitch
  1. 1/2x28 (.22 cal) 2 items
  2. 5/8x24 (.30 cal) 1 item
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  1. Out of stock 116 items Remove This Item
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