Sig Sugar M18 vs P320 Sig Sugar: Which One Will Be Your Better Pick?

The Sig Sauer M18 and P320 are two of the most popular handguns on the market today. Both handguns boast excellent accuracy, reliability, and build quality. But, how do they compare to each other?

Sig Sauer M18 and P320 have differences in construction, design, action, accuracy, and more.

This article will assist which one may be the better choice for your needs. So, if you are considering one of these two handguns- sig m18 vs p320, read on to find out what makes each one unique.

Sig Sugar M18 vs P320 Sig Sugar

Quick Spec Comparison Chart: Sig sugar M18 vs Sig Sugar P320

Check out the distinctions through their specs-

SpecificationsSig sugar M18Sig Sugar P320
Caliber9×19 mm Parabellum9 x 19mm Parabellum
ActionStriker FiredStriker Fired (Short Recoil)
Capacity(1) 17 Rd & (2) 21 Rd Steel Magazines17+1
Barrel length3.9 in4.7 in
Sights radius5.8 in6.6 in
Height5.5 in5.5 in
Overall Length7.2 in8.2 in
Width1.6 in1.3 in
Weight (Oz)28.1 Oz29.6 oz

What Are the Differences Between Sig M18 Vs P320 Sig Sugar Based on Their Features?

Check out the detailed comparison based on their features:

1. Caliber

The Sig Sauer M18 is a 9mm handgun produced by Sig Sauer. It is a striker-fired pistol, based on the U.S. Army’s Modular Handgun System (MHS). The M18 is available to military and law enforcement personnel. It has a 4.7-inch barrel. It features a polymer frame and grips, a Picatinny rail, night sights, and an ambidextrous manual safety.

The Sig Sauer P320 is a striker-fired semi-automatic pistol chambered in 9mm, .357 SIG, .40 S&W, and .45 ACP. The P320 is available in a variety of sizes, including a full size, carry, compact, and subcompact. The full-size P320 is a polymer-framed, double-action-only semi-automatic pistol.

The P320 is a popular choice for law enforcement and the military and is available in a variety of finishes, including two-tone, flat dark earth, and black.

Both pistols are chambered in 9mm and have a variety of finishes and sizes available. Ultimately, it is up to the user to decide which handgun best meets their needs and preferences.

2. Capacity

One 17-round magazine and two 21-round magazines are included with the purchase of a Sig Sauer M18 Semi-Auto Pistol.

The Sig Sauer M18 magazine capacity varies depending on the model. The standard M18 magazine has a capacity of 17 rounds, while the Compact and Carry models have a capacity of 15 rounds.

The standard capacity of the Sig Sauer P320 magazine is 17 rounds for the 9mm Luger, 14 rounds for the .40 S&W, and 10 rounds for the . 45 ACP.

Extended magazines are also available that increase the capacity to 21 rounds for the 9mm Luger and 18 rounds for the .40 S&W. The extended magazines are not available for the .357 SIG.

If you are looking for a pistol for self-defense, the standard 17-round magazine may be the best option, as it provides more rounds while still being compact enough to carry comfortably.

On the other hand, if you are looking for a pistol for target shooting or competition, the extended 21-round magazine may be the better option as it allows for more rounds and better accuracy.

3. Sight System

The M18 comes standard with SIGLITE night sights and a removable night sight rear plate. The slide is optic-ready and directly compatible with the ROMEO1 PRO.

The Sig Sauer P320 X-Ray3 Day/Night Sight with Radius is an adjustable 3-dot sight that features a bright green fiber optic front sight and a rear sight with two tritium lamps for use in low light conditions.

The night sights that come with the three-dot square-picture sights are a nice surprise.

The sight is designed to be used with the Sig Sauer P320 pistol and features a radius cut for a precise fit. The rear sight is adjustable for windage and elevation, and the fiber optic front sight is adjustable for elevation.

Both sights offer excellent visibility in both day and night and have adjustable features to help ensure accuracy. Ultimately, the decision comes down to your own unique needs and preferences.

4. Trigger Pull

The lighter M18’s trigger pull lands consistently at 4.5 pounds. The ergonomics, trigger pull consistency and reset time of the typical curved trigger shoe leave much to be desired.

The trigger is big, has a smooth surface, and is nicely rounded. There’s a soft take-up of about 1/8″ and then a nice let-off. There is no manual safety, but there is an internal one that keeps the striker from moving until the very end of the trigger pull.

On their website, SIG specifies that the basic P320 has a pull weight of 6.5 lb. The majority of P320 triggers users tested have been around 7 pounds.

Some people may prefer the lighter M18 trigger pull and others may prefer the heavier P320 trigger pull. Ultimately, the decision of which is better is up to the individual user.

5. Action

SIG/new Sauer’s P320 is a radical departure from previous models. The differences are positive, though. It has the same high standard of manufacture as SIG.

There is a higher mechanical distinction. The P320 is only capable of double-action firing thanks to its striker mechanism (no hammer).

The M18 is a self-cocking striker-fired pistol with a double-action only trigger. It is a short recoil-operated weapon, which fires with the locked breech.

It uses the typical SIG Sauer cam-operated barrel. The slide is made of stainless steel.

Both SIG Sauer’s P320 and M18 pistols offer excellent performance and accuracy. However, the P320 has the advantage of being easier to use and more cost-effective. The M18 is a more traditional, double-action only pistol with a longer trigger pull, which could be beneficial for some shooters.

6. Reliability

The M18 worked fine with mixed ammunition. It fired 135-grain Hornady Critical Duty, 115-grain Winchester White Box, 124-grain Speer Lawman, and various mixed ammo.

The M18 ran 500 rounds without cleaning. Our single misstep was self-inflicted. The M18 is easy to disassemble, so you could tighten it at the range.

The entry-level Sig gun is the P320. It’s not low-quality. Sig Sauer makes the greatest polymer-framed weapons and the most accurate and reliable pistols. But, accept it, grip frames are almost throwaway.

The Sig P320 is a high-quality pistol, but the M18 is more reliable.

Sig M18 Vs P320: FAQs

Is the Sig P320 a good choice for concealed carry?

Yes, the Sig P320 is an excellent choice for concealed carry. Its small size, lightweight, and ergonomic design make it comfortable and easy to carry. Additionally, its modular design allows for easy customization and personalization.

What kind of safety does M18 come with?

The SIG M18 pistols come equipped with ambidextrous manual safety.

What accessories are available for the Sig P320?

There are many accessories available for the Sig P320, including grips, holsters, sights, barrels, and magazines. Additionally, there are many aftermarket parts available, such as triggers, slides, and other performance enhancements.

What is the effective range of a SIG M18?

The M18 has an effective range of around 25-40 meters. The M18 comes with a Picatinny-type pistol rail. It accepts all standard tactical accessories, such as flashlights and laser pointers.

Is the SIG M18 compatible with other SIG Sauer products?

Yes, the SIG M18 is compatible with a variety of SIG Sauer products, including the P320, P365, P226, and P229.

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