"Powerful" is a subjective term. The velocity of a .45 round varies from about 830 feet per second to about 1180 FPS and the muzzle energy ranges from about 350 foot pounds to about 520 foot pounds.
It depends on the brand. It might stand for "Taurus Handgun" if it's a Taurus. What brand is it?
Several manufacturers offer a .40 handgun - Smith & Wesson, Ruger, Taurus, Beretta, Sig-Sauer, Kel-Tec, Hi Point, Glock, Springfield Armory/HS Produkt... just to name a few.
Undoubtedly, currently the most popular handgun in America is the Glock 17 which fires the 9MM Luger cartridge. Rapidly catching up however are the 40 caliber handguns offered by Glock. In close second would be 9MM and 40 caliber models from: - Sig Sauer - H & K - Beretta - Taurus - Ruger
The number to Taurus customer service is 305-624-1115.
It is a key operated lock on a Taurus handgun. When the lock is ON, the gun cannot be fired. Go to the Taurus website, and you can see how it works.
100-300 USD or so
50-250 usd
50-350 usd
around $30-40
165
gunbroker.com
50-225 USD or so