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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.

Parts

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  1. Springer Precision P320 Extended Magazine Release - Production/ESP
    Springer Precision P320 Extended Magazine Release - Production/ESP
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  2. Tyrant Designs T-Comp Sig Sauer P320
    Tyrant Designs T-Comp Sig Sauer P320
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  3. Sig Sauer P320 OEM Slide Completion Kit
    Sig Sauer P320 OEM Slide Completion Kit
    Special Price $83.99 Regular Price $99.99
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  4. Sig Sauer P238 .380ACP Legion Magazine - 7rd
    Sig Sauer P238 .380ACP Legion Magazine - 7rd
    Special Price $43.99 Regular Price $49.99
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  5. Springer Precision Sig P320 9mm Open Compensator (M13.5 x 1 LH)
    Springer Precision Sig P320 9mm Open Compensator (M13.5 x 1 LH)
    $95.00
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  6. Sig Sauer Grip Module Assembly P320 X-Series Full - Black Medium
    Sig Sauer Grip Module Assembly P320 X-Series Full - Black Medium
    Special Price $49.99 Regular Price $59.99
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  7. Wilson Combat WCP320 Full Grip Module w/ Standard Safety - Tan
    Wilson Combat WCP320 Full Grip Module w/ Standard Safety - Tan
    $67.95
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  8. Empire Tanto Magazine Base Pad for Sig Sauer P365 X/XL
    Empire Tanto Magazine Base Pad for Sig Sauer P365 X/XL
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  9. Empire Katana Magwell For Sig Sauer P320 AXG
    Empire Katana Magwell For Sig Sauer P320 AXG
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  10. Empire Stiletto Trigger For Sig Sauer P320 - Black
    Empire Stiletto Trigger For Sig Sauer P320 - Black
    $84.99
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  11. Tyrant Designs Sig Sauer P320 Extended Mag Release
    Tyrant Designs Sig Sauer P320 Extended Mag Release
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  12. Tyrant Design Sig Sauer P365 Magazine Extension
    Tyrant Design Sig Sauer P365 Magazine Extension
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  13. Empire Katana Magwell For Sig Sauer P320 X-Series - Tano
    Empire Katana Magwell For Sig Sauer P320 X-Series - Tano
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  14. Shalotek Sig Sauer P365XL LCI Barrel - Black Nitride
    Shalotek Sig Sauer P365XL LCI Barrel - Black Nitride
    $99.00
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  15. Sig Sauer Grip Module Assembly P365XL Spectre Series Laser Engraved LXG - Gray
    Sig Sauer Grip Module Assembly P365XL Spectre Series Laser Engraved LXG - Gray
    Special Price $79.95 Regular Price $89.99
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  16. Tyrant Design Sig P365 Extended Slide Release
    Tyrant Design Sig P365 Extended Slide Release
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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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