...don't just focus it on law enforcement. That would get old REAL fast. Give real world tests to handguns, shotguns, long guns, and give honest reviews.
Also, how about articles discussing the "tactical" utility of a gun that wasn't designed for that? Many here on TFL have discussed the defensive uses of the lever rifle, the single-action revolver, etc. You get the idea.
The Lawdog Files.
Make the magazine informative, but also fun and entertaining to read.
Just a few ideas.