May I suggest maybe a compromise? Perhaps an MP5 variant with a foldable stock might be a better choice? Mag acquisition usually isn't a problem, but you might still have that mag pounch problem, albeit you could measure the dimensions and see if you can't improvise using M4 mag pouches.
What's more important: morality or the freewill? In our society most people would say freewill. But we mustn't forget our morality.
Our morality guides our freewill to do the right thing.