Having been a police officer for 25 years, I have accumulated quite a few flashlights. I recently upgraded an old incandescent 6P with a Malkoff drop in unit and I am very pleased with the results. I noticed that there is a Malkoff drop in for a Streamlight Stinger XP as well. I was looking at my Stinger today and it does not seem as modular as the Surefire. Has anyone upgraded their Stinger and care to comment? I also have an old 6 c cell Maglite I used on foot patrol that I would love to make into something special. It is unfortunate I do not have the electrician skill that would allow me to do much beyond a drop in mod.