Pursue Your Passion
My Cart

Rainier Arms on Instagram

Menu
Account
raineirarms

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.

We can't find products matching the selection.
Shop By
Now Shopping by
  1. Option AR-15 Remove This Item
Clear All
Shopping Options
Barrel Length
  1. 8.5" 1 item
  2. 10.3" 1 item
  3. 16" 9 items
  4. 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 5 items
  6. 5.56mm 1 item
  7. 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 4 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 5 items
  2. M-LOK 5 items
Finish
  1. Arid 1 item
  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 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. 1.4" 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. Blackout Defense 5 items
  8. Blitzkrieg Components 1 item
  9. Bootleg 1 item
  10. Bravo Company MFG (BCM) 8 items
  11. Centurion Arms 1 item
  12. Cross Machine Tool (CMT) 5 items
  13. Daniel Defense 2 items
  14. Elftmann Tactical 1 item
  15. Faxon Firearms 2 items
  16. Fortis MFG 3 items
  17. Forward Controls Design 2 items
  18. Geissele 4 items
  19. HERA ARMS 3 items
  20. James Madison Tactical (JMT) 1 item
  21. Knight’s Armament Company (KAC) 2 items
  22. KNS Precision 1 item
  23. Lantac 3 items
  24. Magpul Industries 1 item
  25. Maxim Defense 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 18 items
  3. Picatinny 8 items
Platform
  1. AR-15 5 items
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 2 items
  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" 4 items
  5. 9" 2 items
  6. 9.3" 1 item
  7. 9.5" 3 items
  8. 9.6" 1 item
  9. 10" 7 items
  10. 10.25" 1 item
  11. 10.5" 2 items
  12. 11.1" 1 item
  13. 12" 10 items
  14. 12.25" 1 item
  15. 12.4" 1 item
  16. 12.5" 1 item
  17. 13" 4 items
  18. 13.5" 2 items
  19. 13.7" 4 items
  20. 13.8" 1 item
  21. 14" 1 item
  22. 15" 17 items
  23. 15.3" 1 item
  24. 17" 1 item
Size
  1. 9 Slot 11 items
Thread Pitch
  1. 1/2x28 (.22 cal) 3 items
  2. 5/8x24 (.30 cal) 1 item
Stock Status
  1. Out of stock 125 items Remove This Item
My Wish List
Last Added Items
  1. Add to Cart
    Remove This Item
Go to Wish List
You have no items in your wish list.
Google Customer Reviews Google Customer Reviews