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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.

Parts

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  1. L2D Combat Precision Match Sig Sauer P320 Compact 9MM Barrel - Fluted
    L2D Combat Precision Match Sig Sauer P320 Compact 9MM Barrel - Fluted
    $149.99
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  2. Killer Innovations Sig P320C Velocity Threaded Barrel
    Killer Innovations Sig P320C Velocity Threaded Barrel
    $268.00
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  3. Killer Innovations Sig P320C Velocity Non-Threaded Barrel
    Killer Innovations Sig P320C Velocity Non-Threaded Barrel
    $249.00
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  4. Agency Arms Sig P320 Compact Mid Line Barrel
    Agency Arms Sig P320 Compact Mid Line Barrel
    $200.00
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  5. True Precision SIG Sauer P365XL X-Fluted Match Grade Barrel Threaded 1/2X28
    True Precision SIG Sauer P365XL X-Fluted Match Grade Barrel Threaded 1/2X28
    $170.99 - $189.99
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  6. True Precision Sig Sauer P365XL X-Fluted Match Grade Barrel
    True Precision Sig Sauer P365XL X-Fluted Match Grade Barrel
    $161.49 - $180.49
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  7. Faxon Firearms Sig Sauer P320 Full Size Flamed Barrel
    Faxon Firearms Sig Sauer P320 Full Size Flamed Barrel
    $188.60 - $207.00
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  8. Faxon Firearms Sig Sauer P320 Full Size Flamed Barrel - Threaded
    Faxon Firearms Sig Sauer P320 Full Size Flamed Barrel - Threaded
    $197.80 - $216.20
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  9. Faxon Firearms Sig Sauer P320 Compact Flamed Barrel - Threaded
    Faxon Firearms Sig Sauer P320 Compact Flamed Barrel - Threaded
    $188.60 - $207.00
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  10. Faxon Firearms Sig Sauer P320 Compact Flamed Barrel
    Faxon Firearms Sig Sauer P320 Compact Flamed Barrel
    $179.40 - $204.25
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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. Platform Sig Sauer Remove This Item
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  1. 3.9" 1 item
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  1. 9mm 7 items
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  1. P320 1 item
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  1. Agency Arms 1 item
  2. Faxon Firearms 4 items
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  1. Sig P320 8 items
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  1. $100.00 - $199.99 5 items
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  1. Barrel 10 items
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  1. 1/2x28 2 items
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  1. 1:10 6 items
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  1. In stock 10 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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