Roughly 400 ft/lbs, from a 1911-size gun. Good, but not anything earth-shattering.the 50 gr 9mm version is AP from a pistol 1900 fps
That's good power, but since we're talking about a carbine, it's (again) not anything groundbreaking or earth-shattering. It's less than a typical .30 carbine load (that you so often scorn), for that matter. Even some 9mm loads hit 700 ft/lbs from a carbine, and I know that at least one substantially exceeds it.78 gr .45 variant is 2200 fps from a carbine barrel.
????...simple blowback carbine, take note. So the pressures can't be very high.