Now this I like. I'd use a different cartridge (edit: 5.56x30 MARS specifically), but this is clever! I wonder about the system and the rate of fire.

Edit: RoF is an issue with this design I think because I assume that it is designed as a semi auto with no consideration for FA. So I'd guess at something like 1200 rpm. Taking it down to 700 or so would probably make the gun heavier? In a dream world I'd like balanced recoil, but that is probably greedy.

Having a look at the gun, you have to flip it open to reload. I don't think I'd care to do that when in a stressful situation. This may well negate the advantage of the magazine capacity.

If you can't get the job done with 50 rounds, what makes you think that you'll live long enough to do a reload?   ;^)

I'm alone and fighting off a company and there is more enemies than I have bullets

Buffman shared some more pics:

There is something about this that makes me cringe when thinking of using this in the field.

PDWs are weapons of last resort for folks that don't know how to use them , for most users you might just as well mount a sound system in a plastic gun looking shape ,making bang-bang noises instead of thing actually shooting.

Keltec is not likely to be issued anywhere but ,still is a cool looking gun. 

Was the M1 issued to people who did not know how to use them?

Which M1?

M1 helmet?

M1 rifle?

M1 carbine?

M1 tank?

:^)

Essentially, yes. The Carbine M1 was originally intended for soldiers who had been carrying a pistol, because fighting with small arms was not their job.