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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 Glock 17 Remove This Item
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Barrel Length
  1. 4.5" 1 item
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  1. .45 ACP 1 item
  2. 9mm 31 items
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  1. 9mm, .40, .357 1 item
  2. .45 ACP 1 item
  3. Gen 1-3 1 item
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  7. Gen 5 12 items
  8. Glock .40 cal Gen4 1 item
  9. Glock 9mm Gen4 1 item
  10. Glock Gen 5 2 items
  11. Large Backstrap 1 item
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  18. G42 1 item
  19. G43 2 items
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  10. Nitride 1 item
  11. Polished 1 item
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  13. Titanium Nitride (TiN) 8 items
  14. Molecular Dense Coating (MDC) 6 items
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  1. Agency Arms 17 items
  2. Align Tactical 1 item
  3. Apex Tactical Specialties 11 items
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  5. Armaspec 1 item
  6. Battle Arms Development 3 items
  7. CAA 3 items
  8. CMC Triggers 2 items
  9. DPM Systems Technologies 5 items
  10. Faxon Firearms 2 items
  11. Griffin Armament 2 items
  12. Killer Innovations 17 items
  13. L2D Combat 5 items
  14. Lantac 7 items
  15. Lone Wolf Arms 5 items
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  18. Nomad Defense 6 items
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  22. Radian Weapons 1 item
  23. Rainier Arms, LLC 1 item
  24. SCT Manufacturing 2 items
  25. Spinta Precision 4 items
  26. Sprinco (Tactical Springs) 3 items
  27. Strike Industries 2 items
  28. Taran Tactical Innovations 3 items
  29. Timney Triggers 2 items
  30. Trinity Nevada 2 items
  31. True Precision 2 items
  32. TruGlo 1 item
  33. Tyrant Designs 10 items
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  6. $500.00 - $599.99 2 items
  7. $600.00 - $699.99 1 item
  8. $800.00 and above 2 items
Product Type
  1. Accessory 1 item
  2. Basepad 3 items
  3. Compensator 8 items
  4. Extended Slide Stop 1 item
  5. Guide Rod 12 items
  6. Handgun Barrel 23 items
  7. Handgun Sights 3 items
  8. Magazine Catch 1 item
  9. Magazine Release 2 items
  10. Magwell 8 items
  11. Parts Kit 2 items
  12. Pistol Accessory 3 items
  13. Pistol Frame 3 items
  14. Pistol Part 13 items
  15. Recoil Spring 1 item
  16. Slide 17 items
  17. Slide Parts Kit 1 item
  18. Spring 1 item
  19. Stabilizer Kit 3 items
  20. Thumb Rest 1 item
  21. Trigger 24 items
Size
  1. Full 2 items
Thread Pitch
  1. 1/2x28 (9mm) 19 items
Threaded
  1. Yes 3 items
Twist Rate
  1. 1:10 21 items
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  1. In stock 94 items
  2. Out of stock 36 items
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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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