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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. 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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  3. 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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  4. 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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  5. Geissele MK8 AR-15 Super Modular Rail - DDC
    Geissele MK8 AR-15 Super Modular Rail - DDC
    Out of stock
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  6. Battle Arms Development Lightweight Billet Upper Receiver
    Battle Arms Development Lightweight Billet Upper Receiver
    $239.00
    Out of stock
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  7. Magpul Ladder Style Rail Protector
    Magpul Ladder Style Rail Protector
    Out of stock
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  9. Bootleg Adjustable AR-15 Complete Bolt Carrier Group
    Bootleg Adjustable AR-15 Complete Bolt Carrier Group
    $199.95
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  10. Ribbons Pre Order Noveske NSR GEN 3 AR-15 Handguard - 15"
    Noveske NSR GEN 3 AR-15 Handguard - 15"
    $280.25
    Out of stock
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  11. V Seven Weapon Systems 7075 Billet Enlightened AR15 Upper
    V Seven Weapon Systems 7075 Billet Enlightened AR15 Upper
    $287.12
    Out of stock
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  13. Ribbons Pre Order Noveske NSR GEN 3 AR-15 Handguard - 11.1"
    Noveske NSR GEN 3 AR-15 Handguard - 11.1"
    $261.25
    Out of stock
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  15. Aero Precision AR15 STRIPPED LOWER RECEIVER GEN 2 - BLACK
    Aero Precision AR15 STRIPPED LOWER RECEIVER GEN 2 - BLACK
    $119.99
    Out of stock
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  16. Hera Arms AR15 Grip
    Hera Arms AR15 Grip
    Out of stock
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Items 65-80 of 123

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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 45 items
  2. Parts & Kits 16 items
  3. Buffer Systems 4 items
  4. Trigger Parts 6 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 26 items
  11. Stocks & Braces 2 items
Color
Configuration
  1. AR-15 6 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 14 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. 1.35" 1 item
  4. 1.4" 1 item
  5. 1.42" 1 item
Manufacturer
  1. Aero Precision 20 items
  2. Aeroknox 3 items
  3. Angstadt Arms 1 item
  4. Armaspec 1 item
  5. Arms Republic 1 item
  6. Ballistic Advantage 5 items
  7. Battle Arms Development 7 items
  8. Blackout Defense 5 items
  9. Blitzkrieg Components 1 item
  10. Bootleg 1 item
  11. Bravo Company MFG (BCM) 7 items
  12. Centurion Arms 1 item
  13. Cross Machine Tool (CMT) 5 items
  14. Daniel Defense 2 items
  15. Elftmann Tactical 1 item
  16. Faxon Firearms 2 items
  17. Fortis MFG 2 items
  18. Forward Controls Design 2 items
  19. Geissele 4 items
  20. HERA ARMS 3 items
  21. James Madison Tactical (JMT) 1 item
  22. Knight’s Armament Company (KAC) 2 items
  23. KNS Precision 1 item
  24. Lantac 3 items
  25. Magpul Industries 1 item
  26. Midwest Industries 1 item
  27. NEMO Arms 1 item
  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 16 items
  3. Picatinny 7 items
Platform
  1. AR-15 5 items
Price
  1. $0.00 - $99.99 40 items
  2. $100.00 - $199.99 38 items
  3. $200.00 - $299.99 27 items
  4. $300.00 - $399.99 8 items
  5. $400.00 - $499.99 7 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 Partial Upper Receiver 1 item
  7. AR-15 Handguard 23 items
  8. AR-15 Receiver Set 5 items
  9. AR-15 Stripped Lower Receiver 12 items
  10. AR-15 Stripped Upper Receiver 14 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. Front Sight 1 item
  23. Grip Module 1 item
  24. Handguard 3 items
  25. Lower Parts Kit 5 items
  26. Muzzle Brake 1 item
  27. Parts Kit 1 item
  28. Patch 1 item
  29. Safety Selector 2 items
  30. Sight Post 1 item
  31. Stock Adapter 1 item
  32. Take Down / Pivot Pins 3 items
  33. Trigger 4 items
  34. Trigger Guard 1 item
  35. Upper Parts Kit 1 item
Rail Length
  1. 4" 1 item
  2. 5.5" 1 item
  3. 6.7" 3 items
  4. 7" 5 items
  5. 9" 2 items
  6. 9.25" 1 item
  7. 9.3" 1 item
  8. 9.5" 3 items
  9. 9.6" 1 item
  10. 10" 7 items
  11. 10.25" 1 item
  12. 10.5" 2 items
  13. 11.1" 1 item
  14. 12" 9 items
  15. 12.25" 1 item
  16. 12.4" 1 item
  17. 12.5" 1 item
  18. 13" 4 items
  19. 13.5" 2 items
  20. 13.7" 4 items
  21. 13.8" 1 item
  22. 14" 1 item
  23. 15" 17 items
  24. 15.3" 1 item
  25. 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 123 items Remove This Item
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