I just purchased a DPMS AR15 w/16" bbl. The rifle has a flat top with a removable carry handle. It also has a fixed front sight. Am I correct in saying that the fixed front sight it also part of the gas block? I want to get rid of the fixed front sight and put a flat piece in its place. I am very new to AR's so I really dont know how to go about getting rid of that fixed front sight. Right now it looks like this with the removable handle and fixed front sight: I would like it to look like this (no front sight): I would love some help on this one. Thanks.