Conclusion: I really don't know why there is a such a positive buzz about silent scope. It is an old game and shows its age. It is really garbage compared to other games available today. The bosses are virtually impossible and hard to see with masses of flames around them. Yes, each boss seems to have a mass of flames about them and not die for some reason. I found this game very annoying and a chore to play. Certainly not recommended.
Summary: I own two lightguns which both work great with HOD3 (House Of The Dead 3); the XB99L Light Blaster from Logic3, and the Beretta 92FS Light-Gun from Thrustmaster. Neither of these are compatible with the game "Silent Scope Complete", or rather the game "Silent Scope Complete" is not compatible with those guns (as they work fine in HOD3 and homebrew emulators). You cannot calibrate those guns in Silent Scope Complete making it impossible to play the game.