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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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  1. Aeroknox Rail Grips - M-Lok
    Aeroknox Rail Grips - M-Lok
    $60.00
    Out of stock
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  2. Kinetic Development Group Kinect MLOK 7 Slot
    Kinetic Development Group Kinect MLOK 7 Slot
    $69.81
    Out of stock
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  3. Faxon Firearms 6.5 Grendel 9310 Bolt- Nitride
    Faxon Firearms 6.5 Grendel 9310 Bolt- Nitride
    $68.99
    Out of stock
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  4. 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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  5. Springer Precision MPX Aluminum Magwell
    Springer Precision MPX Aluminum Magwell
    Out of stock
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  8. Kratos Design Group Tenderizer M-LOK Barricade Stop
    Kratos Design Group Tenderizer M-LOK Barricade Stop
    $63.95
    Out of stock
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  9. Magpul DT-PR Carbine Stock Milspec - Black
    Magpul DT-PR Carbine Stock Milspec - Black
    $61.70
    Out of stock
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  12. Knight's Armament Company (KAC) M-LOK Index Stop
    Knight's Armament Company (KAC) M-LOK Index Stop
    $62.37
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Items 65-78 of 78

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Barrel Length
  1. 4.5" 1 item
  2. 16" 2 items
Caliber
  1. .223/5.56 3 items
  2. .30 Cal 1 item
  3. 5.56 NATO 1 item
  4. 6.5 Grendel 1 item
  5. 7.62mm 1 item
  6. 9mm 2 items
Category
  1. Receiver Parts 3 items
  2. Parts & Kits 22 items
  3. Barrels 1 item
  4. Buffer Systems 4 items
  5. Trigger Parts 3 items
  6. Gas Systems 5 items
  7. Muzzle Devices 14 items
  8. Bolt Parts 1 item
  9. Grips 8 items
  10. Charging Handles 6 items
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  12. Stocks & Braces 7 items
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  3. .750 DIA 3 items
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  2. .750" 1 item
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  12. Blitzkrieg Components 1 item
  13. Bravo Company MFG (BCM) 2 items
  14. Daniel Defense 1 item
  15. Faxon Firearms 1 item
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  17. Forward Controls Design 7 items
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  20. HERA ARMS 1 item
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  23. JK Armament 1 item
  24. JL Billet 1 item
  25. Kinetic Development Group 1 item
  26. Knight’s Armament Company (KAC) 1 item
  27. Kaw Valley Precision 1 item
  28. Kratos Design Group 1 item
  29. Krebs Customs 5 items
  30. Lantac 1 item
  31. Magpul Industries 5 items
  32. Next Level Armament 6 items
  33. Noveske 1 item
  34. Rainier Arms, LLC 3 items
  35. Rainier Industries 2 items
  36. Sig Sauer 1 item
  37. Sons of Liberty Gun Works 2 items
  38. Springer Precision 1 item
  39. Timney Triggers 1 item
  40. Tyrant Designs 2 items
  41. V Seven Weapon Systems 6 items
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  3. Springfield Hellcat 1 item
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  2. AR-15 2 items
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  4. Sig Sauer 1 item
  5. Springfield 1 item
Product Type
  1. Angled Grip 4 items
  2. AR-10 / LR 308 Charging Handle 2 items
  3. AR-15 Barrel 1 item
  4. AR-15 Stripped Upper Receiver 2 items
  5. AR-9 Upper Receiver 1 item
  6. Barrel Nut 2 items
  7. Bolt 1 item
  8. Buffer Kit 2 items
  9. Buffer Tube 2 items
  10. Castle Nut / End Plate 1 item
  11. Charging Handle 4 items
  12. Compensator 5 items
  13. Dust Cover 1 item
  14. End Cap 1 item
  15. End Plate 1 item
  16. Failure Resistant Extractor 1 item
  17. Flash Hider 4 items
  18. Forearm Accesory 1 item
  19. Gas Block 5 items
  20. Handstop 3 items
  21. Lower Parts Kit 2 items
  22. Magazine Release 3 items
  23. Magwell 2 items
  24. Muzzle Brake 5 items
  25. Rail Panel 1 item
  26. Safety Selector 9 items
  27. Sight Post 1 item
  28. Sling Mount 1 item
  29. Stock 6 items
  30. Trigger 3 items
  31. Vertical Grip 1 item
Rail Length
  1. 10" 1 item
  2. 14" 1 item
Size
  1. Small 1 item
  2. X-Large 1 item
  3. 7 Slot 1 item
Thread Pitch
  1. 1/2x28 (9mm) 4 items
  2. 1/2x28 (.22 cal) 8 items
  3. 1/2x32 4 items
  4. 1/2x36 3 items
  5. 5/8x24 (.30 cal) 1 item
  6. M13.5x1 LH 4 items
Threaded
  1. Yes 1 item
Stock Status
  1. In stock 50 items
  2. Out of stock 28 items
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