Six round (6+1) .45 ACP.
Glocks are simple, accurate, and virtually indestructible. They will not rust or rot and they usually eat anything of quality.
No external safeties - just aim and shoot.
This one is very slim. a little over an inch. It is also light, ~ 20 oz. empty and 27 oz. loaded.
Six 230 gr. ball or std. HST ammo will deal w/ any problem you can expect to come across, unless you frequent Dope woods or the Border...
...and it also comes w/ another mag.
Did I mention that it's small, slim, and light?