10-31-2011, 08:56 PM
You guys need to go back and look at the photo's I posted. The narrower stack creates spreading forces from the springs which cause the mag to bulge badly, much worse than it does with a proper stack. IE: The springs creates sideways (spreading) force rather than just vertical. In a proper stack each cartridge is in contact with the ones directly above and below in addition to the opposite column. Narrow stack only contacts at angles, creating the spreading force.
Regarding thinner walls, there is a reason the magpuls are so thick... it's about the only way without steel reinforcement to keep the walls from flexing and allowing the feed lips to spread. This is the problem with many past plastic mags, and even some current ones. drop or even jar the mag while not in the gun, it flexes, and rounds come spewing out. (Ram-line mini-14/AR mags were notorious about this, as are some others).
There is a reason even magpul provides a cover.... it takes the spring pressure off the lips and eliminates any chance of flex out of the gun. For the most part you can rap a 5.56 magpul and it won't spew cartridges though, but it's right at the ragged edge.
Regarding thinner walls, there is a reason the magpuls are so thick... it's about the only way without steel reinforcement to keep the walls from flexing and allowing the feed lips to spread. This is the problem with many past plastic mags, and even some current ones. drop or even jar the mag while not in the gun, it flexes, and rounds come spewing out. (Ram-line mini-14/AR mags were notorious about this, as are some others).
There is a reason even magpul provides a cover.... it takes the spring pressure off the lips and eliminates any chance of flex out of the gun. For the most part you can rap a 5.56 magpul and it won't spew cartridges though, but it's right at the ragged edge.