LHS:
Thanks for the input. I am not surprised about the Malkoff bulbs being an option. I have used them for years to convert my old incandescent Surefire handheld lights to LED. I will start looking for a suitable replacement from Malkoff.
As to the possibility of a recent build with older Surefire components, that doesn't surprise me either. Lots of 870 and MP5 Surefire fore-ends got recycled in my old outfit. While Surefire products tend to be pretty expensive, I have found the older weapon mounted light platforms to be pretty much bomb proof or "agent" proof.
Concerning the historical aspect of your gun, I think it is wise to keep track of those things. One thing I typically saw among guns used by folks who actually hunted criminals was a simplicity of set up. A reliable 870 with a light, decent sling and good sights got the job done then and now. The other thing was a smoothness of the action. These type of hard use guns had exterior wear but the action was very smooth and well worn in. That indicated significant use/practice by the person using that gun.
Thanks again,
Bruce