hi i just got a minimag as a gift, and im wondering if i need a regulator for it, i dont see where it would go. it came with a expansion chamber but it just weigs me down so i wanted to just connect a macroline from the asa to the bolt mechanism thing. can the bolt regulate that pressure?
You do not need a regulator for the Minimag. They function just fine with just a line from the ASA to the valve body.
You adjust the pressure/velocity via the allenhead screw on the back of the valve body.
To add an aftermarket regulator you could either use a Palmer's Female Stablizer (ASA+reg in one, no foregrip) or pick up a vertical adapter that would attach near the front of the body rail (there should be a recession on the inside of the rail that you'd punch/drill out for the adapter mount).