I can't decide if it's the pose or the level of detail that I love so much about this! The background is so well done with the light effects and how it borders the subject and 'interacts' with him. The pose really sets the mood and I can almost "hear" the setting he is in (but that may be the abundance of coffee in my system too). A wonderful piece!
Though that isn't the gear/setup I'd take to the field (Not so comfortable drawing of sidearm, googles to blinding of periphiral vision... don't worry just nit picking lol), the picture is pretty awesome. The only thing I would really do different is draw more trees or something to make the background not feel so far away. You did awesome on his pose.
Yeah, there's nothing of the sort, at least not that has a Russian designation. They made short AK-74s, the AKS-74U that replaced their submachine guns. What it does look like is perhaps a Bizon SMG, though the later stick magazine type: [link] The stock looks like an AKS-47, though. Those didn't have short barrels.