Definitely give the index grip a try. Unlike primary mags, you've generally got to get the entire secondary mag into the magwell of the weapon, so beer can grips necessitate a second step after getting the mag's tip in the magwell where you've got to relinquish the beercan grip and push up on the baseplate. You just can't get the mag seated if you're beer canning it, you've got to push from the bottom. These steps are accomplished much faster with an index grip.
Bookmarks