Sig Sauer P320-MAX SXG 9mm 5-inch ROMEO3 MAX, 4x21rd

Description

The Sig Sauer P320-MAX SXG 9mm 5-inch ROMEO3 MAX, 4x21rd is an all-steel, striker-fired competition pistol co-developed with world champion shooter Max Michel. It pairs a 5-inch match-grade bull barrel with a reimagined slide and Hogue alloy grip panels for controlled, repeatable handling, and ships with a pre-installed ROMEO3 MAX 6MOA reflex sight plus four 21-round magazines.

Manufacturer	Sig Sauer
Model	P320-MAX SXG
Material	All-steel frame and slide
Compatibility	P320 holsters and accessories (per manufacturer specs)
Finish	Nitron black
Weight	39.5 oz (unloaded, per manufacturer specs)
Condition	New

Key Features

• All-Steel Construction — Why it matters: The steel frame adds mass to reduce muzzle rise, so you stay on target for faster follow-up shots without the snap of polymer.
• Match-Grade Bull Barrel — Why it matters: A 5-inch barrel with tighter chamber tolerances delivers sub-2-inch groups at 25 yards, giving you the edge on steel and paper.
• ROMEO3 MAX 6MOA Reflex Sight — Why it matters: Pre-installed and zeroed from the factory, the large 6MOA dot picks up fast in competition transitions, and the sight sits low enough to cowitness with the front post.
• Hogue Alloy Grip Panels — Why it matters: The textured aluminum panels lock your hand in place without extra bulk, so you get a consistent grip shot after shot, even with sweaty hands.
• Four 21-Round Magazines — Why it matters: Extended capacity means fewer reloads during practice or match stages, and having four mags lets you load up for back-to-back strings.

Who It’s For

This pistol is built for USPSA Carry Optics and Steel Challenge shooters who want a ready-to-compete rig out of the box. It also fits serious range shooters who prioritize accuracy and ergonomics over weight savings. If you’re a competitor who has been swapping parts on a P320, this skips the build and goes straight to the podium.

Pros / Cons

• Pros: Factory-installed ROMEO3 MAX saves you $400+ on a sight; all-steel frame tames recoil better than any polymer P320; four 21-round mags included ($120+ value); match barrel delivers competition-grade accuracy.
• Cons: At 39.5 ounces unloaded, this is a heavy pistol for concealed carry — it’s strictly a range/competition tool. The 6MOA dot is excellent for speed but less ideal for precision bullseye work past 25 yards.

Comparison

Feature	Sig Sauer P320-MAX SXG	Zev Technologies OZ9	Agency Arms AOS G19
Frame Material	All steel	Aluminum grip module	Polymer
Barrel	5-inch match bull	4.5-inch match	4.02-inch match
Optic Included	ROMEO3 MAX 6MOA	None (sold separately)	None (sold separately)
Magazines	Four 21-round	Two 17-round	Two 15-round
MSRP	$2,199.99	$2,499	$1,899

FAQ

Does the P320-MAX SXG fit standard P320 holsters?

Yes, the slide dimensions and trigger guard match the P320 platform, so it fits most P320 holsters. However, the all-steel frame adds thickness, so you may need a holster designed for the X-Five or TXG grip module. We recommend checking with your holster maker for compatibility with the SXG frame.

Is the ROMEO3 MAX sight removable?

Yes, the ROMEO3 MAX mounts to the slide using two screws and can be removed with a standard Torx driver. The slide is cut for the ROMEO3 footprint, but you can also mount other optics using adapter plates (sold separately).

What is the trigger pull weight on the P320-MAX SXG?

Per Sig Sauer specs, the factory trigger pull is approximately 5.5 to 6.5 pounds. The trigger is a flat-faced competition design with a short reset, and it can be adjusted or replaced with aftermarket parts if you prefer a lighter pull.

Can I use +P ammunition in this pistol?

Yes, the P320-MAX SXG is rated for +P 9mm ammunition. The all-steel construction handles the higher pressure without issue, and the match-grade barrel maintains accuracy with hotter loads. For competition, we recommend standard-pressure 147-grain for soft recoil, but +P works fine for defensive practice.

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Last updated: April 2026

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