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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. Norsso Sig Sauer P320SC Sub/X-Compact Reptile RMR Slide - Black DLC
    Norsso Sig Sauer P320SC Sub/X-Compact Reptile RMR Slide - Black DLC
    $417.05
    Out of stock
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  2. Agency Arms AOS Sig P320 ACRO Optic Plate (Includes Sights)
    Agency Arms AOS Sig P320 ACRO Optic Plate (Includes Sights)
    $145.00
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  3. Norsso Sig Sauer P320C Reptile Ported RMR Slide - Black DLC
    Norsso Sig Sauer P320C Reptile Ported RMR Slide - Black DLC
    $436.05
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  4. 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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  5. Agency Arms Sig P320 Compact/X-Carry Syndicate S1 Field Slide - DLC
    Agency Arms Sig P320 Compact/X-Carry Syndicate S1 Field Slide - DLC
    $575.00
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  6. Agency Arms Sig P320 Compact/X-Carry Syndicate S1 Urban AOS Slide
    Agency Arms Sig P320 Compact/X-Carry Syndicate S1 Urban AOS Slide
    $575.00
    Out of stock
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  7. Trinity Nevada PiRho Sig Sauer P320 Complete Slide - DLC Slide RMR / TiN Barrel
    Trinity Nevada PiRho Sig Sauer P320 Complete Slide - DLC Slide RMR / TiN Barrel
    $1,645.00
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  8. Agency Arms Sig P320 X Series Magwell - Black
    Agency Arms Sig P320 X Series Magwell - Black
    $100.00
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  9. Agency Arms Sig P320 Compact/X-Carry Gavel Slide - DLC
    Agency Arms Sig P320 Compact/X-Carry Gavel Slide - DLC
    $825.00
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  10. Agency Arms Sig P320 Single Port Compensator - Black
    Agency Arms Sig P320 Single Port Compensator - Black
    $108.00
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  11. Agency Arms Sig P320 Compact/X-Carry Syndicate S2 Slide
    Agency Arms Sig P320 Compact/X-Carry Syndicate S2 Slide
    $575.00
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  12. Grayguns Sig Sauer P320 X-Five Laser-Sculpted Grip Module - TXG Tungsten-Infused
    Grayguns Sig Sauer P320 X-Five Laser-Sculpted Grip Module - TXG Tungsten-Infused
    $379.00
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  13. Agency Arms Sig P320 Dual Port Compensator - Black
    Agency Arms Sig P320 Dual Port Compensator - Black
    $100.00
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  14. 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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  15. Sig Sauer X-RAY3 Day/Night Sights
    Sig Sauer X-RAY3 Day/Night Sights
    $99.99
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  16. Rainier Arms Exclusive Danger Close Armament DCA-X5 Select Match 9mm Barrel For Sig P320 X-Five - (5")
    Danger Close Armament DCA-X5 Select Match 9mm Barrel For Sig P320 X-Five - (5")
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Items 113-128 of 151

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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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