To me the long 10 is the mag is 3 1/2". I've seen 3", 2. 7/8" and 2 5/8". Might be others out there. Perhaps it would be better to think of regular and Roman candles or standard and super mags. Was not trying to belittle short as less than anything else. This is a very nice looking gun but I'd use it more if it was below nine and a half pounds and not above 10. I have a Barber-Lefever hammer, thumb opener which is well over ten pounds that I never use because it is too heavy to carry.