why doest some arms co make

why cant some arms co remington winchester mossburg make a auto shot gun that,s drilled and taped on the reciver for a scope to be used for deer and turkeys
it seams stright forward to me all thay have to do is raise the reciver 5/32 for the drilling and taping you could use a scope or not depending what yuo are hunting
both in 12gage and 20gage mags

All of the big makers used to sell rifles drilled and tapped for reciever sights, too. Oh well, gunsmiths have to eat like everybody else. $10-$15 per hole. :-D