So i've recently found the newly added weapon to Dayz (Xbox) KAS-74U, actually i've found it several times, i will explain both below.

First time i saw one i picked it up, and i was wondering why my magazine would'nt enter the gun, and yes it was the right magazine.
I had even tried every AK magazine and none of them worked for the KAS-74U.

Second time i saw it, it was fresh spawned in a military tent, even with a mag inside of it, but the magazine wasnt full, so i decided to take it out and load in 30 bullets. And again the same problem occured, not being able to load a magazine into the KAS-74U and yes i use the right mag since it already was placed inside the gun when i found it. And everyone i know also has this problem with the KAS-74U.