Question about barrel dimpling

[Rated21R]

When getting a barrel dimpled for use with a Vltor low profile gas block (with set screws) is the barrel only dimpled one time?

[RD62]

When getting a barrel dimpled for use with a Vltor low profile gas block (with set screws) is the barrel only dimpled one time?

There should be two dimples.

-RD62

[Belmont31R]

2 is obviously better but Ive seen only one many times.

[Robb Jensen]

I only dimple one screw and then Rocksett that one. The other one is red-loctited.

[Rated21R]

Just wanted to make sure one dimple would be fine, didn't feel like sending it back for another (unless it was necessary). Thanks.