Light American 12's are out there . . . but compared to light British 12's, they're decidedly rare. A 6 3/4# 12ga is at the heavy end of "game gun" weight, by British standards. I recall a guy showing up at our gun club one morning with a Ruger Red Label 28ga. Bragged about how light his gun was. Just so happened someone had a postal scale: Right at 6 1/4. At the time, I had a pair of Army and Navy BLE 12's, 28" barrels, 2 1/2" chambers, made by Webley & Scott. I was shooting one of them. Put it on the scale; his outweighed mine by an ounce. And it's not at all unusual to find quite a few Brit 2 1/2" 12's in that 6 1/4-6 1/2# range.