I have a shoulder holster for my .45 colt. That gun is heavy and it is the best way to carry it. My smaller 9mm and .32 cal PPK are better suited for waistband carry. For my Colt the rig carries the firearm on one side and two clips on the other side to balance things out. To me a rig like that for a knife is only useful for tactical reasons. And just a note even in the US if you were wearing that under your jacket it would be jail in most states if you did not have a CCW permit.