To do it right,the hole should end up centered in a groove.
I second the plan of using the pigtail gastube.It winds a couple loops around the barrel.By lengthening the tube,the gas pulse is delayed.You can also do some tuning with buffers,like H,H-2,etc.
I know someone with a tremendous amount of AR experience that uses them with success.It is also very easy to do.If it works out for you,great!!
If you do not like the results,you can still try your plan.