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.

CZ built the DUTY around a serial-numbered chassis that the polymer grip frame wraps around, the same idea that lets a shooter change frame size without buying a new serial-numbered gun. The trigger is a refined SFDA striker unit, 25 ± 4 N (5.6 ± 0.9 lbs) pull, 0.16 in (4 mm) reset, 9 ± 1 mm (0.4 ± 0.04 in) travel. The slide takes optics by direct mounting; CZ's product photos show Holosun, Aimpoint and Shield units in place. Sights are fixed, the 102 mm barrel is not threaded.

Full-size means 17+1 rounds, a grip that takes the whole hand and a frame 5.6 in (143 mm) high. With the longer base plate the count goes to 19+1. Empty weight is 27.7 oz (780 g), which soaks up recoil without making the gun heavy on a belt.

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

Best fit: home defense, duty use, competition and long range sessions where the extra grip and two more rounds matter. Shooters coming from a CZ 75 will recognize the grip angle; shooters coming from any other striker gun will notice the trigger first.

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. Is the CZ DUTY 4.0 F MS the same gun as the F? Yes, apart from the manual thumb safety. Chassis, trigger, slide and the 17+1 capacity are identical.