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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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  4. 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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  5. 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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  6. Aeroknox Butterfly Brake .223/5.56
    Aeroknox Butterfly Brake .223/5.56
    $90.00
    Out of stock
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  7. Aeroknox Field Pins
    Aeroknox Field Pins
    $37.00
    Out of stock
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  8. 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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  9. Rainier Arms UltraMatch Billet Upper - MOD 3
    Rainier Arms UltraMatch Billet Upper - MOD 3
    $204.95
    Out of stock
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  10. 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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  11. 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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  13. 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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  14. 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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  15. Battle Arms Development Lightweight Billet Upper Receiver
    Battle Arms Development Lightweight Billet Upper Receiver
    $239.00
    Out of stock
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  16. Magpul Ladder Style Rail Protector
    Magpul Ladder Style Rail Protector
    Out of stock
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Items 33-48 of 114

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  1. Price $0.00 - $999.99 Remove This Item
  2. Option AR-15 Remove This Item
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Barrel Length
  1. 16" 9 items
  2. 18" 3 items
Caliber
  1. .223/5.56 2 items
  2. .308 1 item
  3. .45 ACP 1 item
  4. 300 Blackout 1 item
  5. 5.56 NATO 3 items
  6. 7.62x51 2 items
Category
  1. Receiver Parts 42 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
  1. Black 2 items
  2. Cerakote 1 item
  3. Chrome 1 item
  4. FDE 1 item
  5. Nitride 1 item
  6. Phosphate 1 item
  7. 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. Midwest Industries 1 item
  25. NEMO Arms 1 item
  26. Next Level Armament 2 items
  27. Noveske 3 items
  28. Patriot Ordnance Factory (POF) 2 items
  29. Precision Armament 1 item
  30. Primary Weapon Systems 1 item
  31. Rainier Arms, LLC 3 items
  32. Rainier Industries 1 item
  33. Sharps Bros 2 items
  34. Silencerco 2 items
  35. Sionics Weapon Systems 3 items
  36. Sons of Liberty Gun Works 1 item
  37. Stag Arms 1 item
  38. Troy Industries 1 item
  39. Tyrant Designs 1 item
  40. V Seven Weapon Systems 4 items
  41. VLTOR 4 items
  42. WMD Guns 4 items
Mount
  1. KeyMod 7 items
  2. M-LOK 16 items
  3. Picatinny 6 items
Platform
  1. AR-15 4 items
Price
  1. $0.00 - $99.99 38 items
  2. $100.00 - $199.99 37 items
  3. $200.00 - $299.99 24 items
  4. $300.00 - $399.99 6 items
  5. $400.00 - $499.99 6 items
  6. $500.00 - $599.99 1 item
  7. $600.00 - $699.99 1 item
  8. $800.00 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 Handguard 22 items
  7. AR-15 Receiver Set 4 items
  8. AR-15 Stripped Lower Receiver 12 items
  9. AR-15 Stripped Upper Receiver 13 items
  10. Bolt Carrier Group 7 items
  11. Bolt Catch 1 item
  12. Buffer Kit 2 items
  13. Buffer Tube 2 items
  14. Builders Kit 1 item
  15. Cam Pin 1 item
  16. Charging Handle 2 items
  17. Compensator 1 item
  18. End Plate 1 item
  19. Flash Hider 1 item
  20. Forearm Accesory 1 item
  21. Grip Module 1 item
  22. Handguard 3 items
  23. Lower Parts Kit 5 items
  24. Muzzle Brake 1 item
  25. Parts Kit 1 item
  26. Patch 1 item
  27. Safety Selector 2 items
  28. Sight Post 1 item
  29. Stock Adapter 1 item
  30. Take Down / Pivot Pins 2 items
  31. Trigger 1 item
  32. Trigger Guard 1 item
  33. 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 114 items Remove This Item
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