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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. KNS Precision AR15 AR/MCX Stock Adapter With Flange
    KNS Precision AR15 AR/MCX Stock Adapter With Flange
    $51.00
    Out of stock
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  2. Hera Arms AR15 Grip
    Hera Arms AR15 Grip
    Out of stock
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  5. Faxon Firearms Stripped Forged Upper Receiver - 7075-T6
    Faxon Firearms Stripped Forged Upper Receiver - 7075-T6
    $91.99
    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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  8. Battle Arms Development Enhanced Pins Set
    Battle Arms Development Enhanced Pins Set
    Special Price $16.92 Regular Price $28.45
    Out of stock
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  9. 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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  10. Magpul Ladder Style Rail Protector
    Magpul Ladder Style Rail Protector
    Out of stock
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Items 97-109 of 109

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  1. Price $0.00 - $99.99 Remove This Item
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Barrel Length
  1. 7" 2 items
  2. 10.3" 1 item
  3. 16" 14 items
  4. 18" 6 items
Caliber
  1. .223/5.56 3 items
  2. .223 Rem 1 item
  3. .308 1 item
  4. 300 Blackout 1 item
  5. 5.56 NATO 3 items
  6. 5.56mm 1 item
  7. 7.62x51 3 items
  8. 9mm 2 items
Category
  1. Receiver Parts 16 items
  2. Parts & Kits 31 items
  3. Buffer Systems 7 items
  4. Trigger Parts 2 items
  5. Gas Systems 1 item
  6. Muzzle Devices 8 items
  7. Bolt Parts 1 item
  8. Grips 3 items
  9. Charging Handles 20 items
  10. Rifle Handguards 5 items
  11. Stocks & Braces 5 items
Color
Configuration
  1. AR-10 1 item
  2. AR-15 8 items
  3. M-LOK 5 items
  4. Rifle 1 item
  5. Right Hand 1 item
Finish
  1. Black 3 items
  2. DLC 1 item
  3. Nitride 1 item
  4. Anodize 4 items
Gas System Length
  1. Pistol 4 items
  2. Mid 12 items
  3. Intermediate 6 items
Height
  1. Absolute Co-Witness 1 item
Inside Diameter
  1. 1.385" 1 item
Magazine Capacity
  1. 32rd 1 item
Manufacturer
  1. Aero Precision 4 items
  2. Aeroknox 2 items
  3. Airborne Arms 1 item
  4. Andro Corp Industries 1 item
  5. Armaspec 1 item
  6. Arms Republic 2 items
  7. Ballistic Advantage 3 items
  8. Battle Arms Development 3 items
  9. Blitzkrieg Components 8 items
  10. Bootleg 1 item
  11. Bravo Company MFG (BCM) 3 items
  12. Centurion Arms 2 items
  13. Daniel Defense 1 item
  14. Elftmann Tactical 1 item
  15. Faxon Firearms 1 item
  16. Fortis MFG 7 items
  17. Forward Controls Design 5 items
  18. Geissele 2 items
  19. Grey Ghost Precision 1 item
  20. Griffin Armament 2 items
  21. Half Cocked Arms (HCA) 1 item
  22. HERA ARMS 5 items
  23. Icarus Precision 1 item
  24. James Madison Tactical (JMT) 1 item
  25. JL Billet 2 items
  26. JP Enterprises Inc 2 items
  27. Knight’s Armament Company (KAC) 1 item
  28. KNS Precision 4 items
  29. Magpul Industries 4 items
  30. NEMO Arms 1 item
  31. Next Level Armament 1 item
  32. Noveske 2 items
  33. Patriot Ordnance Factory (POF) 2 items
  34. Precision Armament 2 items
  35. Radian Weapons 4 items
  36. Rainier Industries 3 items
  37. Rise Armament 1 item
  38. Silencerco 1 item
  39. Sionics Weapon Systems 1 item
  40. Sons of Liberty Gun Works 1 item
  41. Stag Arms 1 item
  42. Strike Industries 1 item
  43. Troy Industries 1 item
  44. Tyrant Designs 2 items
  45. Underground Tactical 1 item
  46. V Seven Weapon Systems 1 item
  47. VLTOR 8 items
  48. WMD Guns 1 item
Mount
  1. KeyMod 12 items
  2. M-LOK 1 item
  3. Picatinny 13 items
Platform
  1. AR-15 4 items
Price
  1. $0.00 - $9.99 5 items
  2. $10.00 - $19.99 9 items
  3. $20.00 - $29.99 12 items
  4. $30.00 - $39.99 15 items
  5. $40.00 - $49.99 9 items
  6. $50.00 - $59.99 13 items
  7. $60.00 - $69.99 6 items
  8. $70.00 - $79.99 13 items
  9. $80.00 - $89.99 9 items
  10. $90.00 and above 18 items
Product Type
  1. Anti Walk Pins 2 items
  2. AR-15 Assembled Upper Receiver 2 items
  3. AR-15 Charging Handle 17 items
  4. AR-15 Complete Lower Receiver 1 item
  5. AR-15 Handguard 2 items
  6. AR-15 Stripped Lower Receiver 5 items
  7. AR-15 Stripped Upper Receiver 8 items
  8. Bolt Catch 5 items
  9. Buffer Kit 3 items
  10. Buffer Tube 3 items
  11. Cam Pin 1 item
  12. Castle Nut / End Plate 2 items
  13. Charging Handle 7 items
  14. Compensator 1 item
  15. Dust Cover 3 items
  16. End Plate 1 item
  17. Flash Hider 4 items
  18. Forearm Accesory 3 items
  19. Front Sight 1 item
  20. Grip Module 1 item
  21. Lower Parts Kit 7 items
  22. Magazine 1 item
  23. Muzzle Brake 3 items
  24. Patch 1 item
  25. Pistol Grip 1 item
  26. Safety Selector 3 items
  27. Sight Post 8 items
  28. Spring 1 item
  29. Stock 2 items
  30. Stock Adapter 2 items
  31. Take Down / Pivot Pins 7 items
  32. Trigger Guard 1 item
  33. Upper Parts Kit 1 item
Rail Length
  1. 4" 1 item
  2. 7" 1 item
  3. 9" 1 item
  4. 9.2" 1 item
  5. 10" 12 items
  6. 11.25" 1 item
  7. 12" 10 items
  8. 12.6" 2 items
  9. 13.5" 1 item
  10. 15" 2 items
  11. 16.5" 1 item
Size
  1. Medium 2 items
  2. Large 2 items
  3. X-Large 2 items
  4. 5 Slot 2 items
  5. 9 Slot 15 items
Thread Pitch
  1. 1/2x28 (.22 cal) 5 items
  2. 5/8x24 (.30 cal) 2 items
Stock Status
  1. In stock 68 items
  2. Out of stock 40 items
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