How realistic is the SR combat system for firearm?, Like, what's good, and what isn't? Options

[Wounded Ronin]

I think that it would be fair to say that the SR combat system for firearms is relatively realistic, compared to the likes of icky icky d20. But, the SR firearms system has some elements that are clearly unrealistic, such as scopes providing no difficulty at close range, dodge tests, strange grenade timing, or the bizarre damage codes. My question to all of you is how "realistic" are the more "realistic" parts?

What I mean is,
1.) Are the to-hits realistic? Do the amount of times people are likely to get hit vs. be missed compare in any way at all to real stats in terms of things like police officers or FBI agents' recorded accuracy on the job? I realize that this is a pretty difficult question to answer but I also have the feeling that someone might have a gut feeling for this, so it' worth at least asking.

2.) If we don't apply any of that extreme recoil compensation crap how accurately does the SR system reflect the impact of automatic fire upon accuracy? (My guess would be that automatic fire wouldn't make a big difference at close range but would make a huge difference at long range.)

3.) Do you think it would be possible to use some core elements of the SR combat system (i.e. the to-hits) as a starting point of a realism-based firearms combat RPG system?