There was another thread about this somewhere....
But, what the heck, it's both yes and no.
Yes, because something like a mini MP5 or a mini M16 is obviously not real, so it would probably make it past.
No, because something like the mini of the uzi looks too much like a micro uzi, and would be seized as a replica.
It's all about the model. Also, I have heard that they have really bad internals, so I would stay away from them.
Ares M110 LEAF - Ares Striker Tan
TM G17 Pink - KJW P226 TwoTone