I've had issues with those guns too, except mine was that the ammo system was broken and I couldn't reload the guns. You wouldn't have happened to have that problem too would you?
I had a problem at one point where there would be unlimited ammo in one magazine, but I think that's been fixed now.
Those guns suck. (As in H&K)
They personally feel ten times better to use than Tier Tactical which feel like using water guns, especially when it comes to sniper rifles. Not to mention it has way more diversity which would lead to better economics in the firearm scene in roleplay.
I would also like to note that zombies are going to be pretty much gone from RiverSide now as they have absolute no lore reason for being there any-more. However, it is still worth buying or earning a gun in-roleplay for the increased amount of events (and mini encounters) I will be doing in Chapter Three.