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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
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  2. 9mm 39 items
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  17. Killer Innovations 22 items
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  20. Magpul Industries 3 items
  21. NIGHT FISION 7 items
  22. Nomad Defense 2 items
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  25. Radian Weapons 1 item
  26. Rainier Arms, LLC 4 items
  27. Reptilia Corp 1 item
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  11. Glock 27 19 items
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  31. Glock 48 9 items
  32. Sig P320 1 item
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  1. Basepad 3 items
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  4. Firing Pin 1 item
  5. Guide Rod 11 items
  6. Handgun Barrel 29 items
  7. Handgun Sights 5 items
  8. Magazine Release 5 items
  9. Magwell 17 items
  10. Parts Kit 1 item
  11. Pistol Accessory 4 items
  12. Pistol Frame 1 item
  13. Pistol Part 11 items
  14. Pistol Sights 5 items
  15. Recoil Spring 1 item
  16. Slide 22 items
  17. Slide Parts Kit 3 items
  18. Slide Plate 5 items
  19. Stabilizer Kit 3 items
  20. Trigger 17 items
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  2. Full 2 items
Thread Pitch
  1. 1/2x28 (9mm) 14 items
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  2. No 2 items
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  1. 1:10 23 items
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  1. In stock 156 items Remove This 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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