mag fed), a 10 ga autoloader, box mag fed, converted to be a 20mm grenade launcher, .300 WhisperAR upper, .50 bmg ar UPPER. etc, FOR CERTAIN SPECIALIZED uses. However, each of those guns is HORRIBLY limited outside of its special use. The .300 Whisper is for silencing sentries, with subsonic loads and brain shots, at up to 175m. The 300 Mag BAR is for extreme long range sniping, and knocking holes in various strategic containers, at long range, using "pulled" 30-06 Black tip, AP, tungsten carbide wire cored bullets. The 20mm grenade launcher is the ideal weapon for 1 man against many, to 100m. The .50BMG can hurt Big Brother about 10 bill $ with one shot. The 12 auto, with a "spreader" device on its muzzle, using #4 buck, is a mean motorstooter inside 50 ft., yet it won't exit much of a building wall. None of them, however, offer the concealment, one hand use, GI rd, .22 unit, handiness while canned, versatility of the scoped, canned CAR-15 and .22 unit. So that is what gets the not. It's the only sensible choice for shtf. It can do everything that NEEDS doing, WELL enough, and do so better than anything else. In fact, the only other gun that even comes close is the Mini-14, with a .22lr conversion unit.