I thought they were all 3/4 untill i offered to go and get one for a member here a year ago that could not get to picatinny, and i had the wrong feet, and then saw a couple of 1 inch on some in the mta, because now i was nosey, like just not sure what was up, I am also wondering why in David Doyles book they are listed only as 1/2 tons but have seen the heavier 3/4 ton blazers. and are the 3/4 ton blazers ones 1 inch and the 1/2 ton blazers the 3/4 ???????? and i just think its really interesting hobby stuff to find out, I do not know the answer but would love to know, like were they first orders 1/2 and later 3/4 ? is there actually a contract difference somewhere in some guv orders ?