Many American guns that are not worn in any way have lugs that do not fit in the channel tightly. They come from the factory that way. The "fit" that makes the gun tight when open is the fit of the loop to the hinge pin. The fit of the loop to the hinge pin can be renewed by some home remedies that are nearly invisible and long lasting. The most friendly home method involves trimming a thin shim to fit the loop, attaching it by torch and solder or by high tech adhesive, dressing it to fit and to look invisible as possible. The alternative is to not worry about it.