Please provide the following when creating the Ticket:

Game Version number:
Current exp branch
Modded?: (No)

I have had this happen a few times and was able to grab a few screens. The main gun seems to disconnect from turret and you can sometimes find it just sitting in spawn. I don't know if this is an issues with spawned BTR's or if it's just the starting BTR in a conflict match. It does effect your ability to use the gun as when trying to select the KPVT it won't show as available. I was not able to grab a screen of a BTR missing the gun, but i do have shots of the gun sitting in spawn, which is quite detailed and well modeled, it even gives you an interaction prompt as if to pick it up. I don't know what triggers it to come back but have observed it magically reattaching or disappearing in game play.