It looks like bullet penetration may not be working as intended. I went into offline mode and spawned a dummy player behind various different fences and walls (base ones included) and tried to shoot through it with an Sks, M4, UMP and SVD and out of all of those guns the player only died a few times (mostly from the SVD). Other than that and a few minor hits that caused bleeding all of the other rounds looked to have not hit at all. Now this was at point blank range so that doesn't seem right.