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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. 3.54" 1 item
  2. 3.66" 1 item
  3. 3.86" 1 item
  4. 3.9" 2 items
  5. 4.37" 1 item
  6. 4.5" 1 item
  7. 4.57" 1 item
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  1. 9mm 26 items
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  5. Tritium Stealth Sights 1 item
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  6. Nitride 2 items
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  8. Titanium Nitride (TiN) 11 items
  9. Molecular Dense Coating (MDC) 10 items
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  1. Agency Arms 5 items
  2. CAA 3 items
  3. Form Rifle 1 item
  4. Fortis MFG 1 item
  5. Forward Controls Design 2 items
  6. Killer Innovations 18 items
  7. L2D Combat 1 item
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  15. Sig Sauer 1 item
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  19. The Gun Co. 1 item
  20. Timney Triggers 2 items
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  1. CZ P-10 2 items
  2. Glock 17 8 items
  3. Glock 19 15 items
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  8. $270.00 - $279.99 3 items
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  10. $290.00 and above 9 items
Product Type
  1. BackPack 1 item
  2. Barrel 2 items
  3. Grip Module 4 items
  4. Handgun Barrel 24 items
  5. Handgun Grip 1 item
  6. Pistol Frame 4 items
  7. Pistol Part 1 item
  8. Slide 14 items
  9. Stabilizer Kit 3 items
  10. Trigger 3 items
Size
  1. Compact 1 item
Thread Pitch
  1. 1/2x28 (9mm) 12 items
Threaded
  1. Yes 2 items
  2. No 2 items
Twist Rate
  1. 1:10 16 items
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  1. In stock 56 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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