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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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  5. 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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  6. Aero Precision AR-15 M4E1 Stripped Lower Receiver - FDE
    Aero Precision AR-15 M4E1 Stripped Lower Receiver - FDE
    $159.99
    Out of stock
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  7. Aeroknox Butterfly Brake .223/5.56
    Aeroknox Butterfly Brake .223/5.56
    $90.00
    Out of stock
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  8. Aeroknox Field Pins
    Aeroknox Field Pins
    $37.00
    Out of stock
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  9. Aero Precision AR15 Stripped Lower Receiver Gen 2 - FDE
    Aero Precision AR15 Stripped Lower Receiver Gen 2 - FDE
    $139.99
    Out of stock
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  10. Rainier Arms UltraMatch Billet Upper - MOD 3
    Rainier Arms UltraMatch Billet Upper - MOD 3
    $204.95
    Out of stock
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  11. 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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  12. 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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  14. 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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  15. Hera Arms MPSS AR15 90/45 Degree Safety Selector Set
    Hera Arms MPSS AR15 90/45 Degree Safety Selector Set
    $29.90
    Out of stock
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  16. Battle Arms Development Lightweight Billet Upper Receiver
    Battle Arms Development Lightweight Billet Upper Receiver
    $239.00
    Out of stock
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Items 33-48 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
  7. Bolt Parts 9 items
  8. Grips 2 items
  9. Charging Handles 7 items
  10. Rifle Handguards 25 items
  11. Stocks & Braces 2 items
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  2. M-LOK 5 items
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Inside Diameter
  1. 1.3" 1 item
  2. 1.315" 3 items
  3. 1.4" 1 item
  4. 1.42" 1 item
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  4. Armaspec 1 item
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  6. Battle Arms Development 7 items
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  9. Bravo Company MFG (BCM) 8 items
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  11. Cross Machine Tool (CMT) 5 items
  12. Daniel Defense 1 item
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  25. Maxim Defense 1 item
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  29. Noveske 3 items
  30. Patriot Ordnance Factory (POF) 2 items
  31. Precision Armament 1 item
  32. Primary Weapon Systems 1 item
  33. Rainier Arms, LLC 3 items
  34. Rainier Industries 1 item
  35. Sharps Bros 2 items
  36. Silencerco 2 items
  37. Sionics Weapon Systems 3 items
  38. Sons of Liberty Gun Works 1 item
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  40. Troy Industries 1 item
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  42. V Seven Weapon Systems 4 items
  43. VLTOR 4 items
  44. WMD Guns 4 items
Mount
  1. KeyMod 7 items
  2. M-LOK 17 items
  3. Picatinny 6 items
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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