Excellent game, but a tad too easy
Once you get 7 survivors the game is cake. Increasing the chance of losing someone during a search might help, or make the zombies do more damage to the barricade. The guns seemed pretty well balanced, but I'd have to agree with an earlier reviewer who mentioned that the M4A1 was disappointing.
Also, would it be possible to make the player able to swap weapons in the middle of a reload? I would imagine the biggest issue is preventing any exploits of swapping as a means of near-instant reloading. But if this isn't the case, and you can make it so swapping in the middle of a reload will cause the reloading process to start over upon swapping back, I think it would add more value to the idea of having a primary and backup weapon.
A top-notch game nonetheless, very nice work here.