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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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  2. Midwest Industries Enhanced AR-15 Single Stage Trigger w/ Anti-Walk Pins - 3.5lbs
    Midwest Industries Enhanced AR-15 Single Stage Trigger w/ Anti-Walk Pins - 3.5lbs
    $167.95
    Out of stock
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  3. Aero Precision AR15 Enhanced Carbine Buffer Tube Kit - H2
    Aero Precision AR15 Enhanced Carbine Buffer Tube Kit - H2
    $104.99
    Out of stock
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  4. Ballistic Advantage Modern Series 5.56 Government Profile Midlength AR 15 Barrel - 14.5"
    Ballistic Advantage Modern Series 5.56 Government Profile Midlength AR 15 Barrel - 14.5"
    $161.50
    Out of stock
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  5. Fortis MFG AR-15 REV 2.0 Free Float Rail System - FDE
    Fortis MFG AR-15 REV 2.0 Free Float Rail System - FDE
    Out of stock
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  6. Fortis MFG AR-15 REV 2.0 Free Float Rail System - OD Green
    Fortis MFG AR-15 REV 2.0 Free Float Rail System - OD Green
    Out of stock
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  7. Ballistic Advantage AR-15 Enhanced Upper Receiver
    Ballistic Advantage AR-15 Enhanced Upper Receiver
    $113.99
    Out of stock
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  8. Ballistic Advantage BA-10 Upper Receiver
    Ballistic Advantage BA-10 Upper Receiver
    $142.50
    Out of stock
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  9. Centurion Arms CM4 5.56 Forged Upper Receiver
    Centurion Arms CM4 5.56 Forged Upper Receiver
    $109.25
    Out of stock
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  10. Aero Precision M4E1 AR-15 Threaded Stripped Upper Receiver - Black (No Forward Assist)
    Aero Precision M4E1 AR-15 Threaded Stripped Upper Receiver - Black (No Forward Assist)
    $134.99
    Out of stock
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  11. WMD Guns 5.56 Accent Build Kit - FDE
    WMD Guns 5.56 Accent Build Kit - FDE
    $115.00
    Out of stock
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  12. Sons of Liberty Gun Works Blaster Guts Lower Parts Kit - Liberty Fighting Trigger
    Sons of Liberty Gun Works Blaster Guts Lower Parts Kit - Liberty Fighting Trigger
    $120.00
    Out of stock
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  13. Aero Precision M4E1 AR-15 Threaded Stripped Upper Receiver - Black
    Aero Precision M4E1 AR-15 Threaded Stripped Upper Receiver - Black
    $134.99
    Out of stock
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  14. Aero Precision 5.56 Bolt Carrier Group Complete w/ Logo - Black Nitride
    Aero Precision 5.56 Bolt Carrier Group Complete w/ Logo - Black Nitride
    $154.99
    Out of stock
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  15. Battle Arms Development Workhorse AR-15 Stripped Forged Lower Receiver
    Battle Arms Development Workhorse AR-15 Stripped Forged Lower Receiver
    $125.00
    Out of stock
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  16. JP Enterprises Gen 2 Silent Captured Spring for AR-15
    JP Enterprises Gen 2 Silent Captured Spring for AR-15
    $132.95
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  1. Price $100.00 - $199.99 Remove This Item
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Barrel Length
  1. 7" 1 item
  2. 8" 1 item
  3. 10.5" 1 item
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  5. 13.7" 1 item
  6. 16" 1 item
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Caliber
  1. .45 ACP 1 item
  2. 5.56 NATO 6 items
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Category
  1. Receiver Parts 36 items
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Inside Diameter
  1. 1.3" 2 items
  2. 1.315" 4 items
  3. 1.34" 1 item
  4. 1.385" 1 item
  5. 1.4" 1 item
  6. 1.42" 1 item
  7. 1.54" 1 item
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  16. Forward Controls Design 4 items
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  23. JP Enterprises Inc 3 items
  24. Magpul Industries 1 item
  25. Midwest Industries 1 item
  26. Next Level Armament 2 items
  27. Noveske 3 items
  28. Odin Works 1 item
  29. Radian Weapons 2 items
  30. Rainier Arms, LLC 2 items
  31. Rainier Industries 1 item
  32. Seekins Precision 1 item
  33. Sharps Bros 1 item
  34. Sionics Weapon Systems 1 item
  35. Sons of Liberty Gun Works 3 items
  36. Spinta Precision 1 item
  37. Timney Triggers 1 item
  38. V Seven Weapon Systems 2 items
  39. WMD Guns 3 items
Mount
  1. M-LOK 18 items
  2. Picatinny 6 items
Platform
  1. AR-15 7 items
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  1. $100.00 - $109.99 9 items
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  6. $150.00 - $159.99 8 items
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  8. $170.00 - $179.99 5 items
  9. $180.00 - $189.99 3 items
  10. $190.00 and above 9 items
Product Type
  1. AR-10 Handguard 1 item
  2. AR-15 Assembled Upper Receiver 3 items
  3. AR-15 Charging Handle 7 items
  4. AR-15 Handguard 22 items
  5. AR-15 Stripped Lower Receiver 14 items
  6. AR-15 Stripped Upper Receiver 17 items
  7. Barrel 3 items
  8. Bolt 1 item
  9. Bolt Carrier Group 10 items
  10. Buffer Kit 1 item
  11. Buffer Spring 1 item
  12. Builders Kit 1 item
  13. Charging Handle 2 items
  14. Chassis 1 item
  15. Flash Hider 1 item
  16. Handguard 6 items
  17. Lower Parts Kit 3 items
  18. Silent Captured Spring 1 item
  19. Trigger 2 items
Rail Length
  1. 4" 2 items
  2. 4.25" 1 item
  3. 4.5" 1 item
  4. 5.5" 2 items
  5. 6.7" 6 items
  6. 7" 6 items
  7. 7.25" 1 item
  8. 7.5" 2 items
  9. 8.6" 1 item
  10. 9" 5 items
  11. 9.2" 1 item
  12. 9.5" 6 items
  13. 9.6" 3 items
  14. 10.25" 1 item
  15. 10.3" 1 item
  16. 10.5" 4 items
  17. 11.25" 1 item
  18. 11.5" 2 items
  19. 12" 6 items
  20. 12.3" 1 item
  21. 12.4" 3 items
  22. 12.5" 4 items
  23. 12.6" 1 item
  24. 12.8" 1 item
  25. 13" 2 items
  26. 13.5" 3 items
  27. 13.7" 4 items
  28. 13.8" 3 items
  29. 14.3" 1 item
  30. 15" 14 items
  31. 15.3" 3 items
  32. 16.3" 1 item
  33. 16.5" 1 item
Size
  1. 5 Slot 1 item
  2. 9 Slot 2 items
Thread Pitch
  1. 1/2x28 2 items
  2. 5/8x24 1 item
Threaded
  1. Yes 1 item
Twist Rate
  1. 1:7 1 item
  2. 1:10 1 item
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  2. Out of stock 42 items
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