what stormking and schultzy said, either chop it off , and touch it up or replace it, just remember to drive the pins from the small side, as they are wedge shaped.
The adjustable gas blocks are used for a number of things, such as tuning guns to non standard rounds / loads, and for when using with a suppressor.
On most AR rifles they are used to tune the rifle to be a bit smoother shooting, then without them.
