Crawling feels great, can't say anything else than yay. Going prone is quite slow though, what about sliding for a little while if you go prone while running? Maybe not very realistic, but would be cool and interesting little technique.
The guns feel very much better now, and I'd go even farther and decrease the accuracy returning time (forgot the correct term) to nearly zero. This'll encourage firing in bursts, which I guess you're after for.
I dislike the beeps, a better sound would be clock ticking. I like everything else though. Yet another great update!