I feel too many people dawg the M1 Carbine... I think there were too many stories from Korea of it not dropping Chinese troops. When, from the research I've done was actually more due to guys going full auto and simply missing.
The M1 Carbine is light, small, accurate, has good capacity w/ 30rd mags, those of which are light as well when loaded up... and within "most" situations where you would have to use the weapon, the 110gr soft point round hits with enough energy to put someone down.
It's not a 300m weapon, but who the hell(other than combat troops) will be shooting at someone at that range? You should hunker down and let them pass if you can...
For those who fight for it, life has a flavor the protected will never know.