So I'm playing B-Dizl's mini mod. I don't know what version I'm playing v 5.1.4 but I just upgraded to 5.2 even though it hasn't ever worked for me. Anyway, the Coldstream Guards (Old) units aren't firing their rifles as much as regular infantry are. Like when you have them out of light infantry formation only the first rank fires. Don't know if anyone knows this yet and I'm going to attempt to play 5.2 now to see if it's fixed.