superior weapons systems

[zukiii]

hey guys,
im new to the ar world and just recently placed an order for an lmt carbine. i am currently looking at uprades and was wondering if anyone had any opinions on the superior weapons systems rail system (extended carbine length). I read that noveske have been putting these rails on their n4 light carbines, so i figured that they must be good quality.

anyway, any thoughts and opinions would be appreciated.

thanks in advance