A fine Madness indeed....
520s are good sturdy shotguns, and even now, one of the better choices for a "Serious" shotgun. However, there are some caveats.....
Like many JMB designs, the internals are best left to experts. Along with this, many have never had a deep clean in lo these many years. So, get any 520s you acquire to a cognizant smith for cleaning,lube and a checkup.
Slam firing is more of a parlor trick than a combat technique. And, it's rough on things like the lockup. Most folks do it a few times to show off and then revert to normal firing.
HTH....
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