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Sig Sauer

Sig Sauer P320 M18 Carry 9mm 3.9in Barrel 21+1 Capacity Night Sights

(8 Reviews)

SKU: 320CA9M18MS
Model: P320 M18
UPC: 798681607556
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  • Product Details

The Sig Sauer P320 M18 Carry in 9mm caliber represents the pinnacle of reliability, accuracy, and versatility in a compact handgun. With its 3.9-inch barrel and 21+1 round capacity, this pistol offers superior firepower and precision, making it an ideal choice for everyday carry and self-defense scenarios.

Engineered with Sig Sauer's renowned attention to detail, the P320 M18 Carry ensures exceptional performance in any situation. Its night sights provide enhanced visibility in low-light conditions, ensuring quick and precise target acquisition for increased confidence and accuracy.

The 3.9-inch barrel of the P320 M18 Carry strikes a balance between compactness and ballistic performance, making it suitable for both concealed carry and duty use. Whether you're navigating urban environments or engaging targets at longer distances, this pistol delivers the accuracy and reliability you need to stay on target.

With a generous 21+1 round capacity, the P320 M18 Carry provides ample firepower to handle any threat. Whether you're facing multiple assailants or encountering a high-threat situation, this pistol ensures you have the firepower to neutralize the threat effectively.

Designed with user-friendly features and intuitive controls, the P320 M18 Carry offers a comfortable and ergonomic shooting experience. Its modular design allows for easy customization to suit individual preferences, ensuring a personalized fit and optimal performance for every shooter.

Key Features:

  • Night Sights: Enhanced visibility in low-light conditions for quick and precise target acquisition.
  • Compact Design: 3.9-inch barrel strikes a balance between compactness and ballistic performance.
  • 21+1 Round Capacity: Ample firepower to handle multiple threats or high-threat situations effectively.
  • Versatile Application: Suitable for concealed carry, duty use, and self-defense scenarios.
  • Modular Design: Allows for easy customization and personalized fit to suit individual preferences.
  • Reliable Performance: Sig Sauer's renowned reliability and accuracy ensure consistent performance in any situation.
  • Ergonomic Controls: User-friendly design and intuitive controls for a comfortable and efficient shooting experience.
  • Durable Construction: Built to withstand the rigors of daily carry and intensive use, ensuring long-term reliability and durability.




ManufacturerSig Sauer
Pricing UnitGN
ModelP320 M18
Meta DescriptionFind the Sig Sauer P320 M18 Carry, a compact 9mm pistol with 21+1 round capacity, night sights, and exceptional reliability and accuracy.
Meta Keywordsp320 sig m18
Meta TitleUnmatched Performance: Sig Sauer P320 M18 Carry 9mm Pistol
Rebate Start Date2024-03-20
Rebate Expiration2024-03-24
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  • Customer Reviews

5 out of 5

8 total reviews for this product






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Dale H

After mounting a red dot on it I finally got around to shooting it. Not one issue and it is very smooth. The trigger got better after the first 100 rounds as well. Love this gun.

Bruce M.
Great gun to shoot.

I picked up the M18 a little over a month ago.  So far it's been a solid performer.  Except for a couple of glitches, I'm generally happy with it.

About a week after I got it, I mounted a Romeo 1Pro red dot on the slide.  I'm still not sure why Sig decided to put the mounting screws underneath the base plate.  You have to remove the firing pin assembly and the extractor to get to one of the screws.  It's not difficult and there are a couple of good videos online that show how to do it.  I'm also not sure why Sig made the 1Pro so wide.  With the protective steel shroud, there's a good 3-4 mm overhang on either side of the slide.

I've had a few FTFs, especially when the barrel is hot toward the end of a long training session.  I also had an unusual failure where a casing seized up and would not eject.  The entire weapon jammed.   Not just a little.  It was locked up tight.  None of us could free the stuck casing.  I thought I was going to have to take it to a gunsmith.  Eventually, I used the steel shroud of the 1Pro for some leverage and forced the slide back.  I wouldn't recommend using the shroud this way but I was very glad I had mounted it when I put the red dot on.  It did its job of protecting the sight.

I have been running inexpensive steel case target ammo for many years in a wide variety of gun brands with no issues.  This one particular casing had deformed into an oval during expansion.  Since then, I've only used brass ammo in the M18 and have had no more jams.  My other guns eat steel cased ammo like it's candy so I'm not overly concerned about being stuck with ammo I can't use.  If the M18 is your only firearm, I would recommend not using steel-case ammo.  Spend a little more for brass.

I'm going to end on a positive note.  The modularity of the Sig P320 M17/M18 system is a huge plus.  Like I already mentioned, I have a red dot on the M18 slide.  I still like to use iron sights so I bought an M17 slide/barrel kit.  Now I have the best of both worlds without having to carry 2 different guns to the range.  It takes literally seconds to swap slides.  I can let one "rest" while I exercise the other.


Sig is the best!

Just picked mine up yesterday and im in love. Got $50 off for being a member so that was a plus! Very comfortable to shoot and I have fairly small hands(for a guy). Im kinda husky and im able to carry it iwb comfortably. However that will depend on what holster you choose and how you choose to carry but I digress. If the M18 is on your radar you definitely will not have buyers remorse this baby is nice!


Reviewer has purchased this product.

Bryce L

i was torn between this and the bigger brother the M17. i went with the M18 just for the shorter barrel .Overall they are the same pistol except for the barrel. Right out of the box it is ready to go with out any aftermarket parts in my opinion. it has night sights, two 21 round magazines, one 17 round magazine ambi slide release, front and a little velcro M18 patch. In terms of shooting the trigger breaks like glass and with proper grip it wont flip on you. i wear a large mechanix gloves and the texture of the grip and grip itself fits perfectly in my hand. The safety has a vert distinct click when you either engage or disengage it. the color is very nice as well and i personally added a TLR1-HL fde light.if your torn between this or the M17 the only thing it really comes down to is the barrel length. the only downside is that magazines are about a bit pricey but overall for the price you cant go wrong with this handgun. Plus the Marines are issued it so if it is good enough for us its good enough for all.


Reviewer has purchased this product.

Steven F

I had the older brother the m17 and was looking for a smaller compact version and the m18 delivers. Ordered a wilson combat grip module for this bad boy and made me fall in love with it even more.

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