an interesting site tanks and gun dissasembly, its an engineering and entertainment company http://noble-empire.com/news.php gun disasembly 2 is free, there are new models to buy, but its got enough to play with.
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I have one of those apps for my iPad. You get some free guns but most are DLC. I don't remember any tanks so I'll have to look into it again.
This would have been nice to have in small arms school in the Army. The M1911 gets a little tricky when you fully disassemble it.
I don't see how this is considered a game?