It's a pretty neat idea, and it looks like a blast to shoot. Operationally, it's very limited. Pistol caliber long guns and subguns are being phased out by most special operations groups, military tactical teams like FBI HRT and DEA FAST, and law enforcement agencies and tactical teams.
I can see a lot of applicability with this weapon in the European market, but not in the US market.
DinanTronics Stage 1 F30 328i M Sport
Dinan 20" Black Performance Wheels
Gunfighter Training Development and Evaluation
AR15/AR10 Armorer/Advanced Armorer
Gunfighter Training YouTube Channel