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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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  1. 9mm 2 items
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  12. G19 1 item
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  2. Agency Arms 2 items
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  6. Arms Republic 1 item
  7. Battle Arms Development 3 items
  8. CMC Triggers 2 items
  9. DPM Systems Technologies 6 items
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  11. L2D Combat 1 item
  12. Lantac 1 item
  13. Magpul Industries 3 items
  14. NIGHT FISION 5 items
  15. Nomad Defense 3 items
  16. Polymer80 1 item
  17. Rainier Arms, LLC 4 items
  18. Reptilia Corp 1 item
  19. Sprinco (Tactical Springs) 4 items
  20. Strike Industries 2 items
  21. Tyrant Designs 23 items
  22. ZEV Technologies 1 item
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  1. Glock 17 32 items
  2. Glock 19 30 items
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  33. Sig P320 1 item
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  10. $90.00 and above 15 items
Product Type
  1. Basepad 3 items
  2. Compensator 8 items
  3. Guide Rod 12 items
  4. Handgun Sights 3 items
  5. Magazine Release 5 items
  6. Magwell 16 items
  7. Parts Kit 2 items
  8. Pistol Accessory 4 items
  9. Pistol Part 7 items
  10. Pistol Sights 2 items
  11. Recoil Spring 1 item
  12. Slide Parts Kit 2 items
  13. Slide Plate 4 items
  14. Trigger 6 items
Thread Pitch
  1. 1/2x28 (9mm) 1 item
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  1. In stock 75 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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