Review on Efficient Application: 3M 08117 MixPac Applicator Gun for 200 ml Cartridges by Jason Arkin

I've bought 3m and other applicators and this one works much better for spraying 1:1 epoxies for me. But why does this Amazone have 2 2:1 pistons (which I never need) and not a 1:1 piston? A year ago I had glue splatters on the back which is a real mess and it's better to have a larger 1:1 piston which minimizes the chances of the little 'moving disc' holding the glue moving pushes out, doesn't turn sideways and makes a mess .