Have you looked at the Intellibeam version of the Scout? M600IB model. It auto gates itself from 100-600 lumens depending on how much light blow back you’re receiving from things like indoor walls. It rapidly changes so fast in output that you barely even notice it.
The m300 and m600 tailcaps are the same. So it will jam your thumb if you’re riding your thumb on the momentary button and fire a 12 gauge round.
I’he been working out a new light mounting solution which uses the 13” Briley rail, an IWC inline MLOK light mount, the light of your choosing mounted far forward on the ejection port side for a right hand shooter so the bezel or the light is flush with the muzzle. Then a Unity Tactical Hot Button is installed which is essentially a push button momentary/on/off button with a 9 inch wire routed to the left side rail roughly where you want your support hand thumb to reach. Slap on rail covers that you like on the MLOK and add a QD angled sling mount to the rail all the way forward at 9 o’clock. You’d have less risk of jamming your thumb, but not completely eliminated.