The Taurus PT 640 is a semi-automatic pistol chambered in .40 S&W (Smith & Wesson). Here are some details about the Taurus PT 640:

1. Caliber: The Taurus PT 640 is chambered in .40 S&W, which is a popular cartridge known for its relatively high stopping power.
2. Capacity: The PT 640 has a standard magazine capacity of 10 rounds. However, it’s important to note that firearm laws and regulations can vary by jurisdiction, so the actual capacity may be different depending on local laws.
3. Design: The Taurus PT 640 is a compact-sized pistol designed for concealed carry and self-defense. It features a polymer frame, which helps reduce the overall weight of the firearm.
4. Safety Features: The PT 640 includes various safety features, such as a manual safety lever, trigger safety, and a loaded chamber indicator. These safety mechanisms help prevent accidental discharges and enhance user safety.
5. Barrel and Slide: The pistol typically has a 3.25-inch barrel length, which balances compactness with effective muzzle velocity. The slide is made of steel and houses the firing mechanism.
6. Sights: The Taurus PT 640 usually comes with fixed sights, including a front and rear sight. These sights help with aiming and target acquisition.

It’s important to note that while the information provided here is accurate based on the knowledge cutoff in September 2021, it’s always a good idea to refer to the manufacturer’s official website or consult with local firearm experts for the most up-to-date and detailed information about specific firearms.