Gas Block

How do you take the front sight off of an ar15? I wanna put a different gas block and sight on?

Its the default front sight on many ar15′s. I wanna just have a red dot sight on it and they get in the way.

http://ar15.com/forums/topic.html?b=3&f=4&t=226782
scroll down you will see it

been there done that no biggie.

AR15: Chopping a Front Sight / Gas Block Mod