Chicago-area buyers tend to wait for a pistol to prove itself before they commit, but a new CZ striker gun gets attention quickly. The DUTY 4.0 is CZ's next-generation 9x19mm, and its big idea is the serialized modular chassis: the serial number sits on the internal unit, and the fiberglass-reinforced polymer grip frame around it is the swappable part. CZ offers it as the C compact (15+1 rounds, 5.3 inches tall) and the F full-size (17+1, 5.6 inches tall), and both sizes come as MS models with a manual thumb safety.

From Naperville and Joliet in the collar counties, out to DeKalb, Ottawa, Rockford, Peoria and Galesburg, Illinois owners use a pistol like this for home defense, for the range and for concealed carry where they are licensed. The trigger is CZ's refined SFDA with a 4 mm reset, the barrel is 4 inches, and the slide takes a red dot by direct mount with fixed sights alongside.

This is the shorter grip of the two DUTY frames: 135 mm (5.3 in) from the top of the slide to the base plate, 770 g (27.2 oz) empty, 15+1 rounds standard and 17+1 with the extended plate. The slide and 4-inch barrel are the same as the full-size gun, so it shoots like one.

Where the P-10 had a registered 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) (4 mm (0.16 in) reset, 9 ± 1 mm (0.4 ± 0.04 in) travel), a 188 mm (7.4 in) long slide with direct-mount optics cuts, fixed sights and a 4-inch barrel without a thread.

There is no manual thumb safety on this model. Drop safety comes from the firing pin block, the trigger safety and the trigger-bar safety, the way most modern striker-fired pistols are set up. If you want a thumb lever, the MS version has one.

The CZ DUTY 4.0 C suits anyone who wants a modern optics-ready 9mm with CZ's grip and a trigger that is better than the class average: daily carry, a bedside gun that also rides along, and new buyers who want one pistol for everything.

Illinois buyers need a valid FOID card, and the dealer holds the pistol at least 72 hours before pickup. We ship the DUTY 4.0 to the Illinois dealer you name at checkout, and that dealer handles the hold and the background check. Ammunition and gear ship to your door once your FOID is on file. Before you pay, stock and price are verified live.

Questions buyers ask: How long does my Illinois dealer hold the DUTY 4.0 before I can pick it up? At least 72 hours, and you need a valid FOID card. Your dealer runs the check and sets the pickup time. Is the trigger heavy? CZ rates it at 5.6 pounds plus or minus 0.9, with 9 mm of travel and a 4 mm reset. It is a service trigger, not a competition one. Does the CZ DUTY 4.0 C take CZ P-10 magazines? CZ lists the DUTY with its own 15-round magazine and an extended floor plate for 17+1. P-10 magazine fit is not confirmed, so plan on DUTY magazines.