This model is very popular with law enforcement because of its subcompact size and the powerful .357 Sig cartridge with good stopping power. It is also loved by civilians because it offers great performance in self-defense situations: easy handling, fast reload time and great accuracy. It is also lightweight, as a concealed weapon should be. The Gen 4 brings more external controls and grip options. Standard Gen 4 features are a new dual-recoil spring, interchangeable backstraps, a new rough-textured frame, a bigger magazine release button, and a slightly bigger slide. This is a double-action-only pistol, which means that the trigger pull is the same for the first and second shots. The relatively heavy trigger pull minimizes the chance of accidental pulling. The frame is made of highly durable polymer and there are no metal parts. There are no external safeties too, and it’s easy to clean or maintain. Overall, it is a great pistol for concealment and defense.