This isn't much of a post,.....I'm sick. More like a listing of random thoughts.
I like the idea of having a BUG to hand off to an unarmed partner or maybe someone I feel a need to protect. "Hunker down here,......I'm going for help." That's not much of an option without the BUG.
Ever had a floorplate dislodged and spill your load over the ground? I have. A spare mag will probably help, but only if you can get the empty removed from the well. They don't come out nearly as easily with no guts and no floorplate to grab hold of. I once needed a pair of needlenose pliers to get a mag body removed, but I don't generally carry a pair with me.
I've also had a primer back out and tie up a gun. Once it became an intermittent problem for quite some time until it was discovered. The gun would work fine,.......until it wouldn't.
I like to carry a 642. I think it's an 'almost' perfect revolver, but I'm wondering how to handle a cratered primer that ties it up. I've had that happen a couple of times on other revolvers and the only thing that cleared the problem was the leverage I could exert on the exposed hammer spur and the comtrol that the spur gave me. I was able to shear that little bit of primer off and get the gun functioning again, but I wouldn't have been able to do it with trigger pressure alone and having the exposed hammer also let me do it without wildly discharging a shot. The 642 would need a bench to get going again.
A similar thing can happen if recoil causes a round to pull loose in the chamber and prevent the cylinder from rotating. Hasn't happened to me(yet), but it has happened to someone while I was there.
I wonder if George Zimmerman carries a BUG. He wasn't carrying one that night a couple of years ago and as it turned out, he didn't need one,......but it was close. He got pounced in the dark and ended up flat on his back with a guy on top of him beating him to a pulp. He was lucky he was able to access his holstered weapon. Had he been lying on the gun or had his right arm pinned he wouldn't have been able to get off the one shot that he needed. Fortunately, that one shot was enough because the gun jammed after firing, getting tied up in clothing. Lucky for George it didn't just click being shoved up into his attacker like it was,............tap, rack, bang is difficult to accomplish in that situation. Maybe a BUG in an offhand pocket or ankle holster IS a good idea.