Axman

I wasn't sure as there are multiple revisions of the MSA adapter around here, and even though it looked kinda like the one on their website, asking's free. It's like my high school economics teacher used to say, "There are no stupid questions, only inquisitive idiots." I'm still debating on whether or not to mag adapt. I'm putting together a 3-gun kit and while I can clearly see the benefits of the ar magazine for gaming purposes, I can't help but think maintaining a single manual of arms between my rifle and my shotgun's the way to go. But then I look at the price of Pmags...

I'd like to know who made that magazine adapter, how hard was it to install, and where can you get them?

You can't just add the diameters of the ports together to get a total port area. You have to halve the diameters, square them, multiply by pi then add them together. You can see the difference between one blue circle with a 400px diameter v. four yellow circles with 100px diameters. Four circles have a total area of 4(50px^2*pi)=31,416px whereas the single circle has 1(200px^2*pi)=125,664px, or roughly quadruple the area. This can obviously be a problem when drilling ports to spec.