Ehhhh... Although I'm not too horribly torn up that I can't shoot my G34 in this game, I don't know that the barrel length restriction makes sense. While barrel length may have a small effect on overall concealability, overall length and height are much more important. The G34 is actually an excellent demonstration of that - a stock G34 and a stock 5" 1911a1 are almost the same in length and height.
I would submit that the max 5" barrel length rule can be jettisoned as an unnecessary overlap with the box rule (I.A.2.), and the concealment test rule (I.D.1.).
Now if the issue is that the G34/5 are specifically marketed as game guns, that's fine. I'd still lose the barrel length restriction, and ban any pistol marketed as a competition gun by name (off the top of my head, that would include the G34/5, the S&W M&P Pro, the Springfield XD(M) series, the Para P16.40 Limited, and pretty much the entire STI/SVI product line...) I'm not saying that such a move would be a great idea, but it would make more sense than an arbitrary barrel length cutoff.
...
If I were to buy a G19 solely for the purposes of shooting KSTG, isn't that like, reverse gaming?
-C