Guys I’m thinking of building a 7.5" upper. I have a older barrel I can cut down for the project. I’m wondering what size gas port I should use. My main ammo will be m193. I will not be using a can.
Any help would be great.
Thx
Anyone???
Check your PM
From what I can recall .087 or .089 is optimal. Ask Grant or IQ Gunz.