You can't take your sear and modify it to be used in a different class of gun.
Let's just pretend you have an AR-15 with a divorced sear...and that same sear with some modification would fit into say....and FN...you would not be able to make that modification as the FN is a different classs weapon...
A sear for an AR can work across platform from an AR15, to Bushie to a RRA etc...but you can't take it out of the class/family of weapon and fit it to something entirely different.