Very good model. Maybe lacking polygons in the stock just a bit (too sharp edges, I'd say), and personally I'd rather prefer different coloring: black / dark olive or light metal (just tlike the upper part under the back sight) and same color for back sight (small dark part on big bright one makes weird contrast).
Also it's very unusial to hear L4D's Mini-14 sounds here, for a fast-firing automatic weapon (it changes the overall soundscape of the game quite a bit, since most all NPCs are using it), and also to see this gun with such a big magazine and low accuracy.
Although I kinda like the idea of replacing an SMG with a bigger weapon (like, a carbine or even a full-sized rifle).

Also when I'm hosting, reloading is quick (just replacing the magazine) and sounds are normal, but when I'm playing on Friendly Crowbar server, reloading animation is longer (including cocking the gun after replacing the magazine) and the sounds are messy (playing the same file like 2 or 3 times simultaneously with slight delay, making a lot of clanking souns).
Though it's not so awful, I can live with that (so it goes into my modpack (at least, for some time), replacing the "Sleepytime" silenced 10mm SMG from Fallout: New Vegas.

I never leave, I just get distracted.

V92 returns with a banger