I've heard that a scope rail can be mounted on those H&R/NEF shotguns...You just need to find a smith who is willing and talented enough to do it. There are guys who had taken their Tracker II rifled slug guns and had the barrel drilled and tapped for a scope rail. Some have said that the smiths wouldn't touch the 12GA but they would do the 20GA...Their reasoning was barrel wall thickness. But, some have reported to have had a smith do their 12GA barrels as well...So, find a good smith unless you are talented enough to do it yourself.