Wolf T91 12.5 In Upper

[Jiro]

I currently have;

11.5 inch GP= ~0.109
12 inch GP= 0.095
16 inch GP= 0.073

Is the gas port angled or straight? I have 2 16" uppers that I'm going to shorten and I just want to know how much of a headache is going to be.

Angled. No headache.