Hello,
Looking for some help with bedding a one piece Ken Farrel mount on a Stevens200. Model#starts with G.

If I install and tighten the back screws only, then I have a gap between the mount and the reciever on the ejection port side in the front. If I install and tighten the front only screws I get a gap on the ejection port side at the rear.

I'm not sure how to proceed from here. Are the screw holes off a little? Is this normal? Thanks in advance!