so I want to free float my ar. I picked up all the parts I need and have the barrel nut changed out and the old front sight / gas block removed. this is the first time I done a project like this. every thing went smoothly, but I have one question before I install the gas block. the A2 front sight was pined on so I got the longer low profile gas block to cover the pin holes. it has 3 set screws, will I need to dimple the barrel for the 3 set screws. the rearward most hole hits the old pin cut out. the other 2 can be dimpled I think. I've never done this before but have read to use this type of block dimpling needs to be done, right? whos jig do you all like? or is their a better way?