Louisville carries. Lexington carries. The rest of the Bluegrass mostly keeps a pistol in the nightstand and takes it to the range on Saturday, and the new CZ DUTY 4.0 was built for exactly that split. CZ's newest striker-fired 9x19 uses a serialized internal chassis, so the fiberglass-reinforced polymer grip frame is a modular part. The slide is direct-mount optics ready with fixed sights, and the barrel is 4 inches and not threaded.

Pick your size. The DUTY 4.0 C is the compact, 15+1 (17+1 with the extended base plate), 770 g and 135 mm tall, the carry pick for Shepherdsville, Bardstown or Nicholasville. The DUTY 4.0 F is full-size at 17+1 (19+1 extended), 780 g and 143 mm, the better nightstand gun for a house in Georgetown or up in Covington and Florence. Both sizes come with or without a manual thumb safety; the MS marking tells you which. CZ's refined SFDA trigger measures 25±4 N, about 5.6 lbs, with a 4 mm reset. New release, $729 MSRP.

The F is the service-size frame: 5.6 in (143 mm) tall, 27.7 oz (780 g) with an empty magazine, 17+1 rounds of 9mm on board and 19+1 with the longer base plate. The longer grip fills a big hand and settles the gun between shots.

Three things define the DUTY 4.0. First, a serial-numbered modular chassis: the serial-numbered part is inside, the grip frame around it is modular. Second, the trigger, a striker SFDA rated at 25 ± 4 N (5.6 ± 0.9 lbs), 0.16 in (4 mm) reset, 9 ± 1 mm (0.4 ± 0.04 in) travel, which is short and repeatable for a service pistol. Third, a direct-mount optics-ready slide, shown by CZ with Holosun, Aimpoint and Shield dots fitted, so a red dot sits low without a stack of plates.

No external safety here. The firing pin block, trigger safety and trigger-bar safety handle drop safety, and the holster handles the rest. CZ sells the same gun with a thumb safety lever as the MS model.

Who is it for: the belt, the home-defense and the range; the version to buy if you rarely need to hide the gun. 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.

Kentucky has no permit to purchase and no state waiting period. At checkout, name the Kentucky dealer you want, and the DUTY 4.0 ships to that FFL. Your dealer runs the background check at pickup and you leave with the pistol. Ammo, optics and gear ship to your door. A live price and stock confirmation runs when you order, before any payment.

Questions buyers ask: Is the DUTY 4.0 C small enough for daily carry? It is 135 mm tall, 188 mm long, 33 mm wide and 770 g, with 15+1 on board. That is a mid-size carry gun, not a pocket pistol. Can I pick it up in Kentucky without a permit? Yes. Kentucky has no permit to purchase and no state waiting period; the dealer runs the background check when you collect it. How many rounds does the CZ DUTY 4.0 F hold? 17+1 with the standard magazine and 19+1 with the longer base plate.