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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 65

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  1. Sons Of Liberty Gun Works Liberty Broadsword 89 Receiver Upper
    Sons Of Liberty Gun Works Liberty Broadsword 89 Receiver Upper
    $349.13
    Out of stock
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  2. Bravo Company MFG (BCM) Lower Group w/ Mod 2 SOPMOD - WIDEBODY - Black
    Bravo Company MFG (BCM) Lower Group w/ Mod 2 SOPMOD - WIDEBODY - Black
    $405.00
    Out of stock
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  3. Noveske NSR Gen 4 AR-15 M-LOK Handguard - 13.5"
    Noveske NSR Gen 4 AR-15 M-LOK Handguard - 13.5"
    $280.25
    Out of stock
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  4. Sons Of Liberty Gun Works 5.56mm CHF V2 AR-15 Combat Barrel - 16"
    Sons Of Liberty Gun Works 5.56mm CHF V2 AR-15 Combat Barrel - 16"
    $299.25
    Out of stock
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  5. Q LLC Balanced Bolt Catch
    Q LLC Balanced Bolt Catch
    $35.00
    Out of stock
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  6. Noveske AR-15 N4 5.56 NATO SPR Upper - 18"
    Noveske AR-15 N4 5.56 NATO SPR Upper - 18"
    $1,543.75
    Out of stock
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  7. Lewis Machine & Tool (LMT) AR-15 MARS-L Sopmod Complete Lower Receiver
    Lewis Machine & Tool (LMT) AR-15 MARS-L Sopmod Complete Lower Receiver
    $959.00
    Out of stock
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  8. Lewis Machine & Tool (LMT) AR-15 5.56 Semi Auto G2 Piston Bolt Carrier Group
    Lewis Machine & Tool (LMT) AR-15 5.56 Semi Auto G2 Piston Bolt Carrier Group
    $429.00
    Out of stock
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  9. Lewis Machine & Tool (LMT) AR-15 MRP Chrome Lined 5.56 Piston Barrel - 12"
    Lewis Machine & Tool (LMT) AR-15 MRP Chrome Lined 5.56 Piston Barrel - 12"
    $709.00
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  10. Lewis Machine & Tool (LMT) AR-15 MRP-L M-LOK Shovelnose Monolithic Upper Receiver - 11.5"
    Lewis Machine & Tool (LMT) AR-15 MRP-L M-LOK Shovelnose Monolithic Upper Receiver - 11.5"
    $845.10
    Out of stock
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  11. Lewis Machine & Tool (LMT) AR-15 FSB 5.56 Barreled Upper Receiver - 14.5"
    Lewis Machine & Tool (LMT) AR-15 FSB 5.56 Barreled Upper Receiver - 14.5"
    $699.00
    Out of stock
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  12. Sons of Liberty Gun Works M4-89 5.56 AR-15 Upper - 16"
    Sons of Liberty Gun Works M4-89 5.56 AR-15 Upper - 16"
    $855.00
    Out of stock
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  13. Triggertech AR-15 Single Stage Duty Trigger
    Triggertech AR-15 Single Stage Duty Trigger
    Out of stock
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  14. Triggertech AR-15 Two Stage Duty Trigger
    Triggertech AR-15 Two Stage Duty Trigger
    Out of stock
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  15. Sons of Liberty Gun Works M4-EXO3 300 BLK AR-15 Upper - 10.5"
    Sons of Liberty Gun Works M4-EXO3 300 BLK AR-15 Upper - 10.5"
    $712.50
    Out of stock
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  16. Sons of Liberty Gun Works M4-EXO3 5.56 AR-15 Upper - 13.7"
    Sons of Liberty Gun Works M4-EXO3 5.56 AR-15 Upper - 13.7"
    $807.50
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Items 17-32 of 65

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Barrel Length
  1. 10.5" 2 items
  2. 12" 2 items
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  4. 13.7" 2 items
  5. 14.5" 3 items
  6. 16" 9 items
  7. 18" 4 items
  8. 20" 2 items
  9. 22" 3 items
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  1. Receiver Parts 30 items
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  1. 1.315" 1 item
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  12. Lewis Machine & Tool (LMT) 8 items
  13. Noveske 4 items
  14. Obsidian Arms 1 item
  15. Q, LLC 1 item
  16. Rainier Arms, LLC 14 items
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  19. Triggertech 2 items
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  1. AR-15 3 items
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  1. $0.00 - $999.99 64 items
  2. $1,000.00 and above 1 item
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  1. AR-15 Barrel 17 items
  2. AR-15 Charging Handle 2 items
  3. AR-15 Complete Lower Receiver 9 items
  4. AR-15 Complete Upper Receiver 3 items
  5. AR-15 Partial Upper Receiver 9 items
  6. AR-15 Handguard 3 items
  7. AR-15 Receiver Set 2 items
  8. AR-15 Stripped Lower Receiver 6 items
  9. AR-15 Stripped Upper Receiver 1 item
  10. Barrel 1 item
  11. Bolt Carrier Group 2 items
  12. Bolt Catch 1 item
  13. Firing Pin 1 item
  14. Magazine Catch 1 item
  15. Pistol Grip 1 item
  16. Stock 1 item
  17. Trigger 5 items
Rail Length
  1. 7" 1 item
  2. 9" 1 item
  3. 9.5" 1 item
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Threaded
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