Looking at a set of sports master lowers. They are telling me they are one inch shorties. Are they marked or how do you measure to see if they are really - one inch. I measured from the bottom of the sceg to the top of the lower and it was like 18" on the prop side and the thick flange where it bolts to the upper is 3/4" thick. Center prop shaft to top of lower 8 1/4"

If they are really sportmasters thay only come in std. and 2 inch shorter they did not offer a 1 inch shorter lower.Imco did in there verson.
I have a bunch of sportmaster lowers if you need a set.

EB

Thanks brother...