Converting from pump to/from auto is very simple. Locking ring in front of forward handguard/grip is twisted ~45° and locked/unlock from the tube magazine. As with the Super 90 series, it is recoil operated. Anything that hampers recoil could affect cycling.
Took mine out for the first real range session today. Sweet. Really, really, really, really sweet. I have heard about problems with mounting accessories, though.