The Firearms Blog has a post on a patent filing from Magpul Industries for a so-called "quad-stack magazine." Basically, as TFB puts it, the slightly wider magazine accomodates what looks like about ...
Since we posted the piece about the Magpul Quad Stack magazine, I thought it would be interesting to inject into the discussion this newly released magazine by ARMATAC. Whereas the Magpul Quad Stack ...