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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 130

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  1. Triggertech Sig Sauer MCX Trigger - PVD Black
    Triggertech Sig Sauer MCX Trigger - PVD Black
    Out of stock
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  4. 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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  6. 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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  7. Silencerco SCO15 Billet AR15 Lower Receiver
    Silencerco SCO15 Billet AR15 Lower Receiver
    $269.00
    Out of stock
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  8. Silencerco SCO15 Billet AR15 Upper Receiver
    Silencerco SCO15 Billet AR15 Upper Receiver
    $219.00
    Out of stock
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  10. Rainier Arms Match 6mm ARC AR-15 Barrel - 12"
    Rainier Arms Match 6mm ARC AR-15 Barrel - 12"
    $260.00
    Out of stock
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  12. Daniel Defense AR-15 Bolt Carrier Group (BCG)
    Daniel Defense AR-15 Bolt Carrier Group (BCG)
    $228.00
    Out of stock
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  16. Faxon Firearms Big Gunner 8.6BLK AR-10/LR308 Barrel - 12"
    Faxon Firearms Big Gunner 8.6BLK AR-10/LR308 Barrel - 12"
    $219.88
    Out of stock
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Items 17-32 of 130

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Barrel Length
  1. 10.3" 1 item
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  3. 11.5" 1 item
  4. 12" 2 items
  5. 13.7" 1 item
  6. 14.5" 1 item
  7. 16" 13 items
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  9. 18" 3 items
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Barrel Profile
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  1. Receiver Parts 29 items
  2. Barrels 26 items
  3. Trigger Parts 14 items
  4. Muzzle Devices 3 items
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  15. Forward Controls Design 1 item
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  19. Knight’s Armament Company (KAC) 4 items
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  36. Surefire 1 item
  37. Timney Triggers 2 items
  38. Triggertech 1 item
  39. Troy Industries 3 items
  40. V Seven Weapon Systems 1 item
  41. VKTR Industries 3 items
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  43. WMD Guns 1 item
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  1. AR-10/LR308 Barrel 4 items
  2. AR-10 Handguard 2 items
  3. AR-10 Stripped Lower Receiver 3 items
  4. AR-10 Stripped Upper Receiver 2 items
  5. AR-15 Barrel 22 items
  6. AR-15 Complete Lower Receiver 6 items
  7. AR-15 Handguard 14 items
  8. AR-15 Receiver Set 1 item
  9. AR-15 Stripped Lower Receiver 4 items
  10. AR-15 Stripped Upper Receiver 5 items
  11. AR-9 Lower Receiver 2 items
  12. AR-9 Upper Receiver 1 item
  13. Blast Shield 1 item
  14. Bolt Carrier Group 13 items
  15. Brace 1 item
  16. Charging Handle 1 item
  17. Handguard 7 items
  18. Handgun 1 item
  19. Lower Receiver 4 items
  20. Muzzle Brake 1 item
  21. Muzzle Device Accessory 2 items
  22. Rail Adapter 1 item
  23. Scope Mount 1 item
  24. Stock 13 items
  25. Stock Accessory 2 items
  26. Trigger 14 items
Rail Length
  1. 7" 2 items
  2. 7.2" 1 item
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  6. 10.75" 1 item
  7. 11.1" 1 item
  8. 12" 1 item
  9. 12.5" 1 item
  10. 13" 1 item
  11. 13.5" 2 items
  12. 13.7" 1 item
  13. 14" 1 item
  14. 15" 9 items
Size
  1. 9 Slot 1 item
Thread Pitch
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  3. 1/2x28 (.22 cal) 14 items
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  6. M18x1.5 1 item
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