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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. Sig Sauer X-RAY3 Day/Night Sights
    Sig Sauer X-RAY3 Day/Night Sights
    $99.99
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  2. 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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  3. Tyrant Design Sig Sauer P365 Magazine Extension
    Tyrant Design Sig Sauer P365 Magazine Extension
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  4. Empire Katana Magwell For Sig Sauer P320 X-Series - Tano
    Empire Katana Magwell For Sig Sauer P320 X-Series - Tano
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  5. Midwest Industries SIG Muzzle Device Collar for MPX 9mm Models
    Midwest Industries SIG Muzzle Device Collar for MPX 9mm Models
    $9.49
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  6. 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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  7. Tyrant Design Sig Sauer P365 Slide Cap
    Tyrant Design Sig Sauer P365 Slide Cap
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  8. Shalotek Sig Sauer P365XL LCI Barrel - Black Nitride
    Shalotek Sig Sauer P365XL LCI Barrel - Black Nitride
    $99.00
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  9. Springer Precision P320 Extended Magazine Release - Production/ESP
    Springer Precision P320 Extended Magazine Release - Production/ESP
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  10. 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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  11. Apex Tactical Specialties Sig P320 Advanced Flat Trigger
    Apex Tactical Specialties Sig P320 Advanced Flat Trigger
    $61.75
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  12. Apex Tactical Specialties Sig P320 Forward Set Trigger Bar Kit
    Apex Tactical Specialties Sig P320 Forward Set Trigger Bar Kit
    $85.50
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  13. 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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  14. Empire Katana Magwell For Sig Sauer P320 AXG
    Empire Katana Magwell For Sig Sauer P320 AXG
    Out of stock
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  15. Empire Stiletto Trigger For Sig Sauer P320 - Black
    Empire Stiletto Trigger For Sig Sauer P320 - Black
    $84.99
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  16. 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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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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