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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. Battle Arms Development Complete Enhanced Lower Parts Kit
    Battle Arms Development Complete Enhanced Lower Parts Kit
    $125.00
    Out of stock
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  2. Centurion Arms C4 Rail System - Mid Cutout
    Centurion Arms C4 Rail System - Mid Cutout
    $314.00
    Out of stock
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  4. Sharps Bros THE JACK AR-15 Lower Receiver - Gen 2
    Sharps Bros THE JACK AR-15 Lower Receiver - Gen 2
    $275.45
    Out of stock
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  5. 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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  6. Geissele MK8 AR-15 Super Modular Rail - DDC
    Geissele MK8 AR-15 Super Modular Rail - DDC
    Out of stock
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  7. Battle Arms Development Lightweight Billet Upper Receiver
    Battle Arms Development Lightweight Billet Upper Receiver
    $239.00
    Out of stock
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  8. Magpul Ladder Style Rail Protector
    Magpul Ladder Style Rail Protector
    Out of stock
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  10. Bootleg Adjustable AR-15 Complete Bolt Carrier Group
    Bootleg Adjustable AR-15 Complete Bolt Carrier Group
    $199.95
    Out of stock
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  11. 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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  12. 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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  14. 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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  16. 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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Items 81-96 of 124

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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 46 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
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  3. Intermediate 3 items
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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
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  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
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  18. Forward Controls Design 2 items
  19. Geissele 4 items
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  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. Maxim Defense 1 item
  27. Midwest Industries 1 item
  28. NEMO Arms 1 item
  29. Next Level Armament 2 items
  30. Noveske 3 items
  31. Patriot Ordnance Factory (POF) 2 items
  32. Precision Armament 1 item
  33. Primary Weapon Systems 1 item
  34. Rainier Arms, LLC 3 items
  35. Rainier Industries 1 item
  36. Sharps Bros 2 items
  37. Silencerco 2 items
  38. Sionics Weapon Systems 3 items
  39. Sons of Liberty Gun Works 1 item
  40. Stag Arms 1 item
  41. Troy Industries 1 item
  42. Tyrant Designs 1 item
  43. V Seven Weapon Systems 4 items
  44. VLTOR 4 items
  45. WMD Guns 4 items
Mount
  1. KeyMod 7 items
  2. M-LOK 17 items
  3. Picatinny 7 items
Platform
  1. AR-15 5 items
Price
  1. $0.00 - $999.99 123 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 Partial Upper Receiver 1 item
  8. AR-15 Handguard 23 items
  9. AR-15 Receiver Set 5 items
  10. AR-15 Stripped Lower Receiver 12 items
  11. AR-15 Stripped Upper Receiver 14 items
  12. Bolt Carrier Group 7 items
  13. Bolt Catch 1 item
  14. Buffer Kit 2 items
  15. Buffer Tube 2 items
  16. Builders Kit 1 item
  17. Cam Pin 1 item
  18. Charging Handle 2 items
  19. Compensator 1 item
  20. End Plate 1 item
  21. Flash Hider 1 item
  22. Forearm Accesory 1 item
  23. Front Sight 1 item
  24. Grip Module 1 item
  25. Handguard 3 items
  26. Lower Parts Kit 5 items
  27. Muzzle Brake 1 item
  28. Parts Kit 1 item
  29. Patch 1 item
  30. Safety Selector 2 items
  31. Sight Post 1 item
  32. Stock Adapter 1 item
  33. Take Down / Pivot Pins 3 items
  34. Trigger 4 items
  35. Trigger Guard 1 item
  36. 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
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  1. Out of stock 124 items Remove This Item
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