You might make it a little clearer what line of sight you are using for your rifle dimensions. On another point, like about 14 1/2" for my field shotguns, but I do great shooting with a pair of 15 3/4" guns that I will not cut. An experienced shooter has to take the reins from his stock fitter if the dimensions the fitter comes up with are extreme. Your mixing of MM and inches is very confusing to those of us who are trying to help. Are we talking double triggers or single triggers, dimension to front or rear trigger. If a single trigger, what is its position. Who is your maker, inquiring minds want to know.