GunsAmerica

Quick Look

The SIG P320 was introduced in 2014 as SIG Sauer's entry into the modular pistol market. Designed around a serialized fire control unit, it offers unmatched flexibility in configuration. It gained major popularity after being adopted as the U.S. Army's M17/M18, solidifying its position in both civilian and professional markets.

Why It's a Top Choice

Modular frame allows caliber and grip size swaps
Adopted by U.S. military as M17/M18 in 2017
Flat-face trigger offers clean break and reset
Extensive aftermarket support and custom options
Available in full-size, compact, and carry models

Key Variants

SIG P320 M17

Military variant used by the U.S. Army, full-size with manual safety and coyote finish.

SIG P320 X5 Legion

Full-size competition model with tungsten-infused frame and match-grade trigger.

SIG P320 Compact

Mid-size configuration ideal for concealed carry without compromising capacity.

SIG P320 XCompact

Ergonomic compact pistol with optics-ready slide and flat trigger for CCW use.

SIG P320 AXG Classic

Aluminum frame with wood grips, blending classic styling with modern performance.

Competitor Comparison Table

Feature	Sig P320	Glock 17	M&P 9
MSRP	$500–$900	$500–$600	$500–$650
Capacity	15–21 rounds	17 rounds	15–17 rounds
Weight	26–43 oz	~25 oz	~27 oz
Optics-Ready	Yes (select models)	No (MOS variant available)	Yes (2.0 OR models)
Trigger Type	Striker-fired, flat or curved	Striker-fired	Striker-fired
Notable Pro	Fully modular FCU	Proven reliability	Ergonomic grip texture
Notable Con	Heavier than some rivals	Limited modularity	Less aftermarket support

Best Use Cases

Concealed carry and personal defense
Law enforcement and military duty
Competitive shooting and 3-gun
Range training and practice
Modular firearm collectors

FAQs

Can I convert the SIG P320 to another caliber?

Yes, the serialized fire control unit allows easy caliber swaps with appropriate slide and grip modules.

What is the trigger pull weight on the SIG P320?

Factory triggers typically average 5.5–6.5 pounds, depending on variant and generation.

How does the SIG P320 compare to the Glock 17?

The P320 offers more modularity; the Glock 17 is lighter and has wider agency adoption.

SIG P320 for Sale