You want to redesign and modify existing guns ??
No, but that doesn't mean both types couldn't be made side by side...
There seem to be loads of calibres that companies invented for which existing models had to be chambered and redesigned. This would be no different...
When the right to effective self-defence is denied, that right to self-defence which remains is essentially symbolic.
Freedom: Please enjoy responsibly.
Any idea that relies on murder for its survival in intrinsically weak.