I only wish they made 75rd or 100rd drums for AK74's in 5.45x39...I'd stock up on a slew of those. Between the muzzle brake, it's accuracy (which is pretty darn good for an AK, a lot better than I expected), and the ability (at least on my SAR-2) to mount a red-dot...then my SAR-2 with it's new FSB and brake would be my main SHTF rifle, until I run out of ammo for it (which would eventually happen).
But by that point, I'll either be dead, or driving around in my own commandeered APC, and have a lot more armaments than what I started out with, so...
But, in the mean time, it's a toss up between my AUG and my old Norinco underfolder, which has 3 drums waiting for it.
My M4 or 20" SP1 would go first, if I happened to grab one of them by mistake/instead/it was closest to me at the time. After all, I wouldn't be *searching* for it; I'd grab what was there with it's ammo and preloaded mags, and go