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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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  2. Sig Sauer P365 Flat Trigger
    Sig Sauer P365 Flat Trigger
    Special Price $41.99 Regular Price $49.99
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  3. Apex Tactical Specialties Action Enhancement Trigger Kit for Glock 43/43X/48
    Apex Tactical Specialties Action Enhancement Trigger Kit for Glock 43/43X/48
    $128.25 - $133.00
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  5. Tyrant Designs I.T.T.S. Trigger For Glock Gen 3/4
    Tyrant Designs I.T.T.S. Trigger For Glock Gen 3/4
    $67.45
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  6. Tyrant Designs Sig Sauer P320 Trigger
    Tyrant Designs Sig Sauer P320 Trigger
    $71.95
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  7. Tyrant Designs ITTS 43/43x/48 Trigger For Glock - w/ Gold Safety
    Tyrant Designs ITTS 43/43x/48 Trigger For Glock - w/ Gold Safety
    $67.45
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  8. Tyrant Designs Intellifire Trigger For Sig P365
    Tyrant Designs Intellifire Trigger For Sig P365
    $85.46
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  9. Nomad Defense Flat Trigger Kit For Glock Gen 3-5 - Safety
    Nomad Defense Flat Trigger Kit For Glock Gen 3-5 - Safety
    $49.00
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  10. Grayguns Sig Sauer P320 Competition Adjustable Trigger System
    Grayguns Sig Sauer P320 Competition Adjustable Trigger System
    $159.00 - $164.00
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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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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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