both front and back are loose, but not enough for shims, they both(front and rear)just slide right through. someone else told me to tap the lip of each slot to tighten them . i am going to look through my junk box and see if i can match up a set that might work before i do anything.

Peen the barrel. Just use a small chisel and lightly put a few dings into the dove tail on the barrel. I wish i could get you better help with pictures but i am in new mexico at my sisters for the night. Having to peen the barrel is common on a lot of kit rifles.

Front Gander is right just tap the dovetail with a hammer and punch lightly this will tighten up the dovetail and the sight will hold. Do both faces of the dove tale slot

TAKE A CENTER PUNCH AND DIMPLE THE DOVE SLOT THIS WILL RAISE THE METAL FOR A BETTER SIGHT FIT
OR SOME ALUMINUM OR BRASS SHIMS WILL WORK

all i need to do now is work on the sights some more. i punched the rear slot with about six punches but its still to loose to grip the sight without it just sliding out.