Quick couple general questions (not necessarily related to del-ton):

I noticed the rifle in the previous pic, the handguards look really short, is that a CAR kit or M4 kit (i thought the gas block on CAR's were longer than M4's)?

Secondly, does a "standard A2 front sight" interfere with potential optics? Again, after looking at the previous pic, it would appear that is an OK option, or would a flip up be better?

Thanks in advance,
Tim