Can anyone please provide any info, experience, details, etc. regarding light-laser combos for a Glock 21 with rails? There seems to be so many different models/options out there. Streamlight, Insight, Glock, Quickfire... What is the best bang for the buck? I have a Lasermax system in a G23 which works great, but no light. Would anyone recommend using 2 seperate devices? For example: Lasermax + an M3 Light, instead of an M6 type combo. Any feedback provided would be greatly appreciated. Thanks.