i used to frequent a range that required you to put your rifles not on the line in a rifle rack. i witnessed a guy wonder where his rifle walked off to... come to find out another shooter took it out of the rack thinking it was his... i figured a red bolt shroud would make it obvious to anyone that it was not their rifle, should it ever happen to me.

sort of like choosing dive gear that is pink... NO ONE else (males) on the dive boat will take your pink dive gear, i have not tried that technique but i know a DM who swears by it. lol