I also use a dump pouch that attaches to my belt. Simple, durable and utilitarian. Just practice drop mag from rifle, deposit in pouch, grab full mag on way up and load. Muscle memory. If such situation arises where I have to put this to real-world use, I may not be too keen about hanging around and scrounging any longer than necessary. If all my mags are accounted for, I can quickly take what i can off the OPFOR and get out of the area in case he has friends or the ruckus attracts others. Get off the X ASAP.