Not sure how things work in Iceland
, but in these parts when Joe Crackhead and E. Money goes into rob the local 7-11, bank, Pizza Hut or whatever there is usualy a vehicle involved.
Concealing their weapons, no matter what it is, is not considered as a rule. It is usualy just the opposite. If they could get a wheeled cannon through the door, that would be the choice.
Shotguns , of all sizes , shapes and forms are used regularly.
Shotguns are not a probelm for the career criminal.
What is the problem of the career criminal is the chance that upon entering an establishment to rob, there could possibly be one, two or more citizens in the area, with a concealed carry permit , who are armed, trained and efficient with their weapon of choice .
Shock factor is what they depend on more than anything else.