Swift, when aksing about a particular AS gun, it's common courtesy to post a link in your post to the exact gun you're looking at on the exact page; so we can better answer your question. Yes it is in the wrong section but I'll move it to "AEG discussion" for you.
If you could edit your post and insert a link so I know exactly what you're talking about that'd be great and I'd be glad to help. As for now, the Kart M14, if I know which model you're talking about It's very expensive. I have read one review that told of it actually falling apart in the field. No other details were givin on the matter, so I don't know what to think. My KWA M4 is a strong gun but if the right screws get rattled loose, it has fallen apart in the field too. It was an easy fix.
That's all I got for now, until I get a link to the page you're looking at.