The most practical function in our opinion. You won't waste your time at the field looking for that one valve key lost somewhere in your gearbag. Instead you have it right inside your wallet and can adjust your magazines anytime.
CO2 Mag turning
These CO2 caps are not easy to turn, we're well aware. Replace your CO2 mags quickly thanks to this card without the usual struggle of using coins or any other improvised tool you may think of.
There are too many functions to mention them all but the wrench slots might really get you out of a pinch when things just cannot be done by hand.