ISIS is suggesting its jihadists attack gun shop owners who are closing their businesses

at the end of the day as a means of acquiring firearms.
I don't think that'll work out the way they think.

The idiots have also been listening to Mommies Want, and believed them.
In the U.S., “anything from a single-shot shotgun all the way up to a semi-automatic AR-15 rifle can be purchased at showrooms or through online sales – by way of private dealers – with no background checks, and without requiring either an ID or a gun license,” ISIS states.
Straight out of the Mommies/Bloomberg/Schumer talking points.

They're not totally nuts
"...while keeping in mind that tactical and gun shop owners are normally the type who arm and train themselves and would not be as averse to engaging in a firefight when attacked.”
Ya think maybe?  Not to mention(they didn't) that the shops are alarmed, and the cops are going to response rather quickly(most places, at least) to such a place being robbed.

Mentioned this at the range the other day; the shift manager has been of the opinion for some time that at closing would be when the place was most vulnerable, and extra care is taken.  And that started well before this noise.