its truly an awesome gun and I feel that if any other company had produced this exact same gun, particularly the gen 2 model, it would be fetching a $700-$1k+ MSRP with no questions asked. this thing is just so versatile...
first of all, its an amazing plinker/range gun for shooters of all levels. the 9mm Glock version is particularly appealing for this purpose because not only is 9mm one of the cheapest, most accessible calibers in terms of ammo, but in this small sized, rifle-length package it is extremely tame, fun, and easy to shoot. should be great for smaller framed people and women and children....
I can imagine this being very popular with the family/friends when your at the range....especially when you add 33rd Glock mags to the equation!
It also makes an awesome home defense weapon either alongside a shotgun/AR or if your like me, in place of them....obviously those guns serve very different purposes and I'm not suggesting you do the same as me...but I can tell tell you from fondling this weapon for the last month its PERFECT for inside the home or outside in the yard. I would absolutely prefer to grab this in the middle of the night facing a break-in or a disturbance outside etc. IMO, the Sub2000 would excel in very the same home/self defense situations where maybe a shotgun is traditionally recommended or preferred(in place of a handgun or rifle). It would also make an excellent gun to keep in your vehicle for the same sort of reasons.
Third, this gun would def rock as an "urban combat survival rifle" as you put it...again the 9mm version being particularly attractive for this role. Being able to scavenge an amazingly popular handgun cartridge like the 9mm is just priceless. I can't think of many guns more ideal in these scenarios than a Suppressed Sub2kG2 in 9mm luger.
As far as Nutnfancy reviews....I've actually watched both of his reviews on the Sub2k and I also found them to be very good and informative. His philosophy of use stuff is pretty good(active shooter response gun for LEO is a neat idea). My only gripes would be his terrible optic setups and his dismissal of the 9mm round's "stopping power", although to be fair he says this about all 9mm caliber guns including pistols.
www.ballisticsbytheinch.com says differently....muzzle energy is very comparable between a Sub2k and a SBR AR-15.