I'm working on my 1st build and I have a question. I purchased a Wilson 18" S/S barrel. When I received the barrel it came with only 1 dimple in the barrel for the low profile gas block. Is this normal? Do I only need 1 dimple or am I suppose to dimple for the 2nd one myself. Is the 1 dimple there so I can lock the gas block down in place and exactly mark where the 2nd dimple goes? Thanks in advance for any help I can get.