Seems like there's a bug in the game at the moment(14.03.2015), which doesn't let you finish any type of game action, whether it's field strip of a model, dis-assembly , or anything like that, the complete model just keeps spinning after you click the message which congratulates you upon completion. The game doesn't count model completion if you exit.
 "Gun Disassembly"){kind=icon}
 "Give Up"){kind=icon}