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Parts

Our amazing offer consists of a great variety of AR-10, AR-15, and pistol parts and accessories. Purchase upper receivers, muzzle devices, handguards, BCG, barrels, triggers, magazine extensions, etc., and start modifying your firearm today.

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Firearm parts

Rainier Arms is the best place to purchase parts and accessories for your rifle or pistol online, and all that for more than affordable prices. Look no further, you can find here everything that comes to your mind and more! The best manufacturers in the business, like Killer Innovations, Lantac, Next Level Armament, Rainier Arms LLC, Apex Tactical Specialties, and many more are here to offer you their high-quality products. Select your preferred part and make your AR-10, AR-15 or pistol a unique piece of firearm.

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Barrel Length
  1. 4.02" 1 item
  2. 4.5" 1 item
Caliber
  1. .45 ACP 1 item
  2. 9mm 40 items
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  1. 1st - 3rd Gen 1 item
  2. 9mm, .40, .357 1 item
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  7. GEN 4/5 1 item
  8. Gen 5 8 items
  9. Glock .40 cal Gen4 1 item
  10. Glock 9mm Gen4 1 item
  11. Glock Gen 5 2 items
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  15. G17 5 items
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  21. Tritium Stealth Sights 1 item
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  11. DLC 22 items
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  13. Gray 4 items
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  17. Red 2 items
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  20. Titanium Nitride (TiN) 21 items
  21. Titanium-Carbo Nitride (TiCN) 1 item
  22. Molecular Dense Coating (MDC) 10 items
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  1. Absolute Co-Witness 1 item
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  2. Agency Arms 16 items
  3. Apex Tactical Specialties 11 items
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  7. Battle Arms Development 6 items
  8. CAA 3 items
  9. CMC Triggers 2 items
  10. Danger Close Armament 1 item
  11. Devil Dog Concepts 3 items
  12. DPM Systems Technologies 6 items
  13. Faction 1 item
  14. Faxon Firearms 3 items
  15. Fortis MFG 2 items
  16. Griffin Armament 1 item
  17. Handleitgrips 1 item
  18. Kagwerks 1 item
  19. Killer Innovations 26 items
  20. KNS Precision 1 item
  21. L2D Combat 4 items
  22. Lantac 6 items
  23. Magpul Industries 3 items
  24. NIGHT FISION 8 items
  25. Nomad Defense 2 items
  26. Norsso 4 items
  27. Polymer80 1 item
  28. Radian Weapons 1 item
  29. Rainier Arms, LLC 4 items
  30. Reptilia Corp 1 item
  31. Sprinco (Tactical Springs) 5 items
  32. Strike Industries 5 items
  33. Swampfox 1 item
  34. Tam Tamography 1 item
  35. Timney Triggers 2 items
  36. Trinity Nevada 4 items
  37. True Precision 7 items
  38. Tyrant Designs 27 items
  39. ZEV Technologies 1 item
Model
  1. Glock 17 65 items
  2. Glock 19 85 items
  3. Glock 19X 10 items
  4. Glock 20 5 items
  5. Glock 21 5 items
  6. Glock 22 28 items
  7. Glock 23 29 items
  8. Glock 24 11 items
  9. Glock 25 7 items
  10. Glock 26 26 items
  11. Glock 27 19 items
  12. Glock 28 3 items
  13. Glock 29 4 items
  14. Glock 30 4 items
  15. Glock 31 25 items
  16. Glock 32 23 items
  17. Glock 33 18 items
  18. Glock 34 35 items
  19. Glock 35 23 items
  20. Glock 36 3 items
  21. Glock 37 14 items
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  23. Glock 39 11 items
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  25. Glock 41 4 items
  26. Glock 42 3 items
  27. Glock 43 18 items
  28. Glock 43X 10 items
  29. Glock 44 4 items
  30. Glock 45 11 items
  31. Glock 48 9 items
  32. Sig P320 1 item
  33. Sig P365XL 1 item
Platform
  1. Glock 158 items
  2. Sig Sauer 2 items
Price
  1. $0.00 - $999.99 174 items
  2. $1,000.00 and above 1 item
Product Type
  1. Backplate 1 item
  2. Basepad 3 items
  3. Compensator 18 items
  4. Extended Slide Stop 1 item
  5. Firing Pin 1 item
  6. Grip Accessory 1 item
  7. Guide Rod 11 items
  8. Handgun Barrel 30 items
  9. Handgun Sights 5 items
  10. Iron Sight 1 item
  11. Magazine Accessory 1 item
  12. Magazine Extension 3 items
  13. Magazine Release 5 items
  14. Magwell 17 items
  15. Parts Kit 1 item
  16. Pistol Accessory 4 items
  17. Pistol Frame 1 item
  18. Pistol Part 11 items
  19. Pistol Sights 5 items
  20. Recoil Spring 1 item
  21. Sight Post 1 item
  22. Slide 23 items
  23. Slide Parts Kit 3 items
  24. Slide Plate 5 items
  25. Stabilizer Kit 3 items
  26. Trigger 17 items
Size
  1. Compact 4 items
  2. Full 2 items
Thread Pitch
  1. 1/2x28 (9mm) 15 items
Threaded
  1. Yes 1 item
  2. No 2 items
Twist Rate
  1. 1:10 23 items
Stock Status
  1. In stock 174 items Remove This Item
  2. Out of stock 1 item
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What are the most common barrel thread patterns for pistols and rifles?

For .22LR, .22MAG, .17HMR, 9mm, and .223/5.56 NATO the most common thread pattern would be 1/2x28, with some exceptions for 9mm and .223/5.56 NATO firearms. As for .308/7.62mm and .338 Lapua Magnum, the thread pattern that is most commonly used is 5/8x24, with a few exceptions. Another typical thread pattern is 9/16x24 and it is mostly used for .40 S&W weapons.

Single triggers or two-stage triggers?

Whichever you choose, you cannot go wrong. The single trigger is fast and simple to use; as soon as you apply a small amount of pressure, the firearm goes off. Two-stage trigger is extremely accurate and you know precisely when the shot is going to be fired. The first stage prepares you for the second one, when the trigger pushes the hammer up causing the firearm to discharge. So, it is up to you to make a choice.

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