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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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  2. True Precision Sig Sauer P365 X-Fluted Match Grade Barrel
    True Precision Sig Sauer P365 X-Fluted Match Grade Barrel
    $161.49 - $180.49
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  3. True Precision Sig Sauer P365 X-Fluted Match Grade Barrel Threaded 1/2X28
    True Precision Sig Sauer P365 X-Fluted Match Grade Barrel Threaded 1/2X28
    $170.99 - $189.99
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  4. 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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  5. Killer Innovations Sig P320 X-Compact Velocity Non-Threaded Barrel
    Killer Innovations Sig P320 X-Compact Velocity Non-Threaded Barrel
    $249.00
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  6. Agency Arms Sig P320 Compact Premier Line Threaded Barrel
    Agency Arms Sig P320 Compact Premier Line Threaded Barrel
    $310.00
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  7. Agency Arms Sig P320 Compact Premier Line Barrel
    Agency Arms Sig P320 Compact Premier Line Barrel
    $300.00
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  8. 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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  9. 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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  10. 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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  11. Faxon Firearms Sig Sauer P320 Compact Flamed Barrel
    Faxon Firearms Sig Sauer P320 Compact Flamed Barrel
    $179.40 - $204.25
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  12. True Precision Sig P320 Compact 3.9" Non-Threaded Barrel
    True Precision Sig P320 Compact 3.9" Non-Threaded Barrel
    $180.49 - $199.49
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  13. True Precision Sig P320 Compact 3.9" Threaded Barrel
    True Precision Sig P320 Compact 3.9" Threaded Barrel
    $199.49 - $218.49
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  14. Faxon Firearms Match Series Sig Sauer P365XL 9mm Barrel
    Faxon Firearms Match Series Sig Sauer P365XL 9mm Barrel
    $161.00 - $179.40
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  15. Rainier Arms Exclusive Danger Close Armament DCA-320 Select Match 9mm Barrel For Sig P320 - (3.9")
    Danger Close Armament DCA-320 Select Match 9mm Barrel For Sig P320 - (3.9")
    Out of stock
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  16. Faxon Firearms Match Series Sig Sauer P365XL 9mm Threaded Barrel
    Faxon Firearms Match Series Sig Sauer P365XL 9mm Threaded Barrel
    Out of stock
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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. 3.1" 2 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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