It's the refusal to return the magazines that really gets me. The trumped up argument about not returning the ammunition is bad enough (especially depending on how much was seized and what kind of ammo) but the magazines?
Maybe it was because I grew up with the AWB and spent half my childhood being dragged from gun store to gun store, searching for pre ban mags, but that strikes me almost as bad as taking the guns. Especially when you consider how hard it can be to just to find magazines for rare pistols, much less, how much they can cost.