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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. Aero Precision AR-15 M4E1 Stripped Lower Receiver - Black
    Aero Precision AR-15 M4E1 Stripped Lower Receiver - Black
    $139.99
    Out of stock
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  2. 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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  3. Troy Industries Ambidextrous Magazine Release
    Troy Industries Ambidextrous Magazine Release
    $58.00
    Out of stock
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  4. Stag Arms A2 Pistol Grip
    Stag Arms A2 Pistol Grip
    $3.50
    Out of stock
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  5. VLTOR Flash Hider - VC:A2
    VLTOR Flash Hider - VC:A2
    $54.86
    Out of stock
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  6. Young Mfg Aluminum Railed Gas Block - .750
    Young Mfg Aluminum Railed Gas Block - .750
    $39.00
    Out of stock
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  7. Young Mfg National Match LITE Bolt Carrier Group
    Young Mfg National Match LITE Bolt Carrier Group
    $265.00
    Out of stock
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  8. NorthTech Defense Titanium Forward Assist
    NorthTech Defense Titanium Forward Assist
    $47.45
    Out of stock
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  9. Rainier Arms Forged Mil-Spec Upper Receiver
    Rainier Arms Forged Mil-Spec Upper Receiver
    $125.00
    Out of stock
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  10. VLTOR 6 Position Receiver Extension - RE-10
    VLTOR 6 Position Receiver Extension - RE-10
    $49.46
    Out of stock
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  11. VLTOR 7 Position Receiver Extension - A5
    VLTOR 7 Position Receiver Extension - A5
    $49.46
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  12. Noveske QD End Plate
    Noveske QD End Plate
    $28.50
    Out of stock
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  14. Geissele MK14 AR-15 Super Modular Rail
    Geissele MK14 AR-15 Super Modular Rail
    Out of stock
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Items 81-96 of 115

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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 43 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
Color
Configuration
  1. AR-15 5 items
  2. M-LOK 5 items
Finish
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  2. Black 2 items
  3. Cerakote 1 item
  4. Chrome 1 item
  5. FDE 1 item
  6. Nitride 1 item
  7. Phosphate 1 item
  8. Anodize 12 items
Gas System Length
  1. Pistol 2 items
  2. Mid 7 items
  3. Intermediate 3 items
Height
  1. Absolute Co-Witness 1 item
Inside Diameter
  1. 1.3" 1 item
  2. 1.315" 3 items
  3. 1.4" 1 item
  4. 1.42" 1 item
Manufacturer
  1. Aero Precision 20 items
  2. Aeroknox 3 items
  3. Angstadt Arms 1 item
  4. Armaspec 1 item
  5. Ballistic Advantage 5 items
  6. Battle Arms Development 7 items
  7. Blitzkrieg Components 1 item
  8. Bootleg 1 item
  9. Bravo Company MFG (BCM) 8 items
  10. Centurion Arms 1 item
  11. Cross Machine Tool (CMT) 5 items
  12. Daniel Defense 1 item
  13. Elftmann Tactical 1 item
  14. Faxon Firearms 2 items
  15. Fortis MFG 1 item
  16. Forward Controls Design 1 item
  17. Geissele 3 items
  18. HERA ARMS 3 items
  19. James Madison Tactical (JMT) 1 item
  20. Knight’s Armament Company (KAC) 2 items
  21. KNS Precision 1 item
  22. Lantac 3 items
  23. Magpul Industries 1 item
  24. Maxim Defense 1 item
  25. Midwest Industries 1 item
  26. NEMO Arms 1 item
  27. Next Level Armament 2 items
  28. Noveske 3 items
  29. Patriot Ordnance Factory (POF) 2 items
  30. Precision Armament 1 item
  31. Primary Weapon Systems 1 item
  32. Rainier Arms, LLC 3 items
  33. Rainier Industries 1 item
  34. Sharps Bros 2 items
  35. Silencerco 2 items
  36. Sionics Weapon Systems 3 items
  37. Sons of Liberty Gun Works 1 item
  38. Stag Arms 1 item
  39. Troy Industries 1 item
  40. Tyrant Designs 1 item
  41. V Seven Weapon Systems 4 items
  42. VLTOR 4 items
  43. 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 - $999.99 114 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 12 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. In stock 1 item
  2. Out of stock 114 items Remove This Item
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