Sometimes the gun is the mascot like the old Bren LMGs. Where as old guns are sometimes used for training, fire drills, PT drills in full gear etc etc.
I'd always wondered! My CCF armoury circa 1987 had racks upon racks of the then new Cadet GP rifle, but the stars of the armoury were two Bren guns. I often wondered what they were doing in there. They were never used as far as I know.
On ear protection I suffered through two decades of ranges, equipped with yellow foam plugs that rendered the shouted range commands unheard by all.
Then I moved into civilian aviation and discovered noise cancelling ear defenders which block out high frequency jet noise but still allow you to hear the guy speaking next to you. What an amazing bit of kit! Too expensive for the Mk1 expendable serviceman I'd imagine.