is there any kind of mount for a 39 that requires no permanent changes to the rifle. my club recently had a "millsurp" rifle shoot and i have a hard time making accurate shots with how thick the front post is. half the rifles others were using had diopter sights or new scopes. i know there is the jmeck option but that requires removing a bit of wood. not sure if there is a non permanent solid option. also somewhere i could get a second front post to file down. as always thanks!