Originally Posted by The Saint
What are we talking about specifically? Dimensions or design? IIRC, both KWA and CA use tabs (like TM) to hold the upper down.
I personally don't trust those tabs, even in metal (airsoft) guns, so I'd never get a CA or KWA.
Design, The KWA lower is desgined to take 2 piece hop up units, and quick release upper in mind