A purchase option for some weapons to have a larger magazine. I'd put it very expensive. I was thinking the Eviserator has too small a magazine and that I'm constantly reloading as a beserker. The perk has no options for a bigger magazine in the perk tree. I could also see this magazine option being useful for some very small magazine weapons. I'd suggest it be very expensive so as not to be abused by perks that already have the option for larger magazines.