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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. Model Sig P320 Remove This Item
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Barrel Length
  1. 3.54" 1 item
  2. 3.6" 2 items
  3. 3.86" 1 item
  4. 3.9" 7 items
  5. 4.57" 1 item
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  1. SDM 1 item
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  1. 9mm 21 items
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  3. P320 6 items
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  5. Anodize 1 item
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  7. Quench Polish Quench (QPQ) 1 item
  8. Titanium Nitride (TiN) 4 items
  9. Molecular Dense Coating (MDC) 2 items
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  1. Agency Arms 5 items
  2. Align Tactical 4 items
  3. Apex Tactical Specialties 4 items
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  7. DPM Systems Technologies 8 items
  8. Faxon Firearms 4 items
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  13. Killer Innovations 9 items
  14. L2D Combat 1 item
  15. Mirzon 3 items
  16. NIGHT FISION 1 item
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  19. Rainier Arms, LLC 2 items
  20. Sharps Bros 3 items
  21. Sig Sauer 16 items
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  24. The Gun Co. 1 item
  25. True Precision 5 items
  26. Tyrant Designs 8 items
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  6. $600.00 and above 2 items
Product Type
  1. BackPack 1 item
  2. Backplate 1 item
  3. Basepad 2 items
  4. Compensator 4 items
  5. Failure Resistant Extractor 1 item
  6. Fire Control Unit 1 item
  7. Grip Module 13 items
  8. Guide Rod 7 items
  9. Handgun Barrel 19 items
  10. Handgun Sights 1 item
  11. Magazine Release 5 items
  12. Magwell 6 items
  13. Optic Plate 1 item
  14. Parts Kit 1 item
  15. Pistol Accessory 1 item
  16. Pistol Frame 5 items
  17. Pistol Part 2 items
  18. Pistol Sights 3 items
  19. Recoil Spring 7 items
  20. Slide 9 items
  21. Slide Parts Kit 1 item
  22. Spring 1 item
  23. Stabilizer Kit 1 item
  24. Take Down / Pivot Pins 1 item
  25. Trigger 8 items
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  5. Compact 4 items
  6. Carry 1 item
  7. Full 2 items
Thread Pitch
  1. 1/2x28 (9mm) 10 items
Threaded
  1. Yes 1 item
  2. No 3 items
Twist Rate
  1. 1:10 14 items
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  1. In stock 99 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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