There is no swinging it around. It is very compact.
I am not aware of any clip fed shotguns. What are you talking about?
You're correct. Pump action shotguns are more reliable than semiauto shotguns.
Only mag fed shotgun I know that is modestly priced and easy to find is the Saiga series -
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I am leery of those because they've only been out for a bit, and have attracted the attention of anti-gunners.
In America, there are two things that are usually looked at for a shotgun to get ATF clearance -
The barrel is over .50, so it technically falls under firearms laws as a "destructive device". You cannot own arms over .50 in America without jumping through some special hoops. The ATF usuals forgives this rule for shotguns if they serve a sporting purpose , so it might be safe there. The other problem is the detachable magazine, in general the ATF likes the magazine capacity of a shotgun to stay under a certain limit, if it goes past that limit, they start to look at it as non sporting firearm, and if directed will take steps to ban it.
Right now they are safe because they are pretty new to the market, but they'd be a pretty easy ban if any governmental agency decided to make an issue of it.