Show-Me State shooters have been asking when CZ's next striker gun would land, and here it is. The DUTY 4.0 is a 9x19mm service pistol built on a serialized modular chassis, which means the polymer grip frame around it can change while the serial number stays put. Four versions come to Missouri: the DUTY 4.0 C compact with 15+1 rounds, the full-size DUTY 4.0 F with 17+1, and an MS version of each that adds a manual thumb safety. All four share the same 4-inch barrel, a direct-mount optics-ready slide and fixed sights.

From Chesterfield and St. Charles down the river to Ste. Genevieve and Perryville, and west to Rolla and Columbia, this is the kind of pistol Missouri buyers pick for the nightstand, the range bag and everyday carry. The compact rides easier under a shirt; the full-size gives a longer grip for duty belts and match days. Both weigh under 28 ounces.

Compact means 15+1 rounds in a frame 5.3 in (135 mm) high. Fit the extended floor plate and it holds 17+1. At 27.2 oz (770 g) unloaded it sits between a pocket pistol and a full-size gun, which is exactly where a carry-and-bedside 9mm belongs.

Where the P-10 had a serialized polymer frame, the DUTY 4.0 moves the serial number to an internal modular chassis. That is the headline. The rest follows the modern service-pistol formula done carefully: a striker SFDA trigger at 25 ± 4 N (5.6 ± 0.9 lbs) (0.16 in (4 mm) reset, 9 ± 1 mm (0.4 ± 0.04 in) travel), a 7.4 in (188 mm) long slide with direct-mount optics cuts, fixed sights and a 102 mm barrel without a thread.

A manual thumb safety is the one thing that separates this model from its sibling. It sits beside the three passive safeties, firing pin block, trigger safety and trigger-bar safety, and does not change the trigger pull.

Who is it for: concealed carry where your state allows it, home defense, and range time that does not need a full-size grip. If you already shoot a P-10, the DUTY is the next step in the same family, with a new chassis and the optics done right.

Missouri makes this simple. There is no permit to acquire and no waiting period, so once your DUTY 4.0 reaches the Missouri dealer you named at checkout, that dealer runs the background check and hands it over the same visit. Ammo and gear ship straight to your door. Price and stock are confirmed live when you order, before you pay.

Questions buyers ask: Do I need a permit to buy the CZ DUTY 4.0 in Missouri? No. Missouri repealed its permit to acquire in 2007 and has no waiting period. Your dealer runs the federal background check when you pick it up. Which DUTY 4.0 is better for carry in St. Louis traffic and summer heat? The C compact is 5.3 inches tall and carries 15+1, so it hides better under light clothing. The F adds a longer grip and two more rounds for range or duty use. What does MS mean on the CZ DUTY 4.0 C MS? Manual safety. It adds a thumb lever to the firing pin block, trigger safety and trigger-bar safety that every DUTY has.