Alright so I've definitely decided that I will be purchasing one of the many G4's in the future. So after doing some research and watching some videos I've narrowed down my choices to these three:
-http://www.airsoftgi.com/product_info.php?cPath=139_24_302&products_id=6344 (G4-A3 SP)
-http://www.airsoftgi.com/product_info.php?cPath=139_24_302&products_id=5110 (G4-A1 w/Daniel Defense 9")
-http://www.airsoftgi.com/product_info.php?cPath=139_24_302&products_id=5995 (G4-18 Carbine)
So I know that for the most part, the internals of G4's are the same. But, I also know out of these three none of them have the same rail system. The G4-18 has a Daniel Defense 9" Sopmod RIS. The G4-A3 has a Daniel Defense 7" Omega RIS. and lastly, the G4-A1 comes with a Daniel Defense 9" Lite Rail. So I'm wondering, are there any major differences between these rail systems in these guns? Also if you happen to own one of the three G4's listed here, it would be very helpful if you could post any problems you've had.