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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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  3. Nemo Arms Titanium Take Down Pin Set
    Nemo Arms Titanium Take Down Pin Set
    Out of stock
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  5. Hera Arms HUS AR-15 Billet Upper Receivers
    Hera Arms HUS AR-15 Billet Upper Receivers
    $139.00
    Out of stock
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  7. Armaspec Gun Builder's Lower Parts Kit - Black
    Armaspec Gun Builder's Lower Parts Kit - Black
    $67.49
    Out of stock
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  10. Battle Arms Development Complete Enhanced Lower Parts Kit
    Battle Arms Development Complete Enhanced Lower Parts Kit
    $125.00
    Out of stock
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  11. Centurion Arms C4 Rail System - Mid Cutout
    Centurion Arms C4 Rail System - Mid Cutout
    $314.00
    Out of stock
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  13. Sharps Bros THE JACK AR-15 Lower Receiver - Gen 2
    Sharps Bros THE JACK AR-15 Lower Receiver - Gen 2
    $275.45
    Out of stock
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  15. Lantac N15 Raven Billet Receiver Set
    Lantac N15 Raven Billet Receiver Set
    $458.99
    Out of stock
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  16. Lantac SF15 USR FORGED UPPER & LOWER SET
    Lantac SF15 USR FORGED UPPER & LOWER SET
    $305.98
    Out of stock
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Items 65-80 of 116

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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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  1. AR-15 5 items
  2. M-LOK 5 items
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  8. Anodize 12 items
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  2. Mid 7 items
  3. Intermediate 3 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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  1. Aero Precision 20 items
  2. Aeroknox 3 items
  3. Angstadt Arms 1 item
  4. Armaspec 1 item
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  6. Battle Arms Development 7 items
  7. Blitzkrieg Components 1 item
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  9. Bravo Company MFG (BCM) 8 items
  10. Centurion Arms 1 item
  11. Cross Machine Tool (CMT) 5 items
  12. Daniel Defense 1 item
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  20. James Madison Tactical (JMT) 1 item
  21. Knight’s Armament Company (KAC) 2 items
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  24. Magpul Industries 1 item
  25. Maxim Defense 1 item
  26. Midwest Industries 1 item
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  28. Next Level Armament 2 items
  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
  39. Stag Arms 1 item
  40. Troy Industries 1 item
  41. Tyrant Designs 1 item
  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
Stock Status
  1. Out of stock 116 items Remove This Item
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