Since every company seems to have different contours and GAP's Bartlien barrels have different numbers than Bartliens own contours I am confused. I'm leaning toward a straight taper but I'm not sure which one. I've seen a lot of GAP #7's in pictures but I'm not sure if that is the same as their M24/M40 contour. Do they have #7 and #14 contours similar to those shown on Bartlien's website? Any one have experience with these?