I've got a Mossberg 500 w/ the heat shield, and I would like to be able to attach a flashlight and possibly laser to it. I've seen several tri-rail mounts that attach to either the magazine tube or the barrel (I've got a 5-round mag, so there is room in front of the magazine to attach a rail). In order to be closer to the barrel, I would prefer to attach a rail to the barrel itself, rather than the mag. Unfortunately the only rails I've seen that attach to the barrel are the diamond shape on the inside and I've read lots of reports about those scratching he barrel finish.