My Victory also comes loose rather quickly. Not much different from my Buckmark UDX that does the same thing.
I used blue loctite on the Buckmark and have been shooting it for almost a year with only cleaning with a pull through, q-tips, and brass brush.
I will do the same thing with the Victory, and use much the same items to clean it.
I like both the Buckmark and the Victory, so I am okay with loctite on the take down screw.