Looks a bit like those Colt survival rifles. But single shot.

The 5.7x28 is a truly bad and evil cartridge. Our local Police about 15 to 20 years ago wanted to ban it. Along with other evil "sniper" cartridges, .338 Lapua, BMG .50 etc. Somehow the .416 Rem Mag got on the list ... But the 57x28 was an evil round capable of "penetrating police bullet proof vests from a handgun". I think someone wanted Goa'uld armour being penetrated by the 5.7x28 !

I forget it's ballistics.

One of these would make a nice survival rifle,small scope, in a plane boat vehicle, backpack. Better if it was a semi auto handgun modified with a rifle barrel

Might even be legal here as a single shot.