U CAN'T carry the kitchen sink. By the time you've
survived needing to fire the gun at all, there will be lots of guns and ammo laying around, waiting to be picked-up. For the lames who don't believe that luminous sights, trigger job, scope, etc have any value, just pick up another gun. For those with a properly-outfitted AR, there will be AR's or M16's laying around, too. So the idea that one needs to lug around 10 lbs of "fix it" stuff, or that you will be able to ACCESS same, that you've cached, is pretty far fetched. For instance, exposy-compounds are basically RUINED by being exposed to freezing temps, before they are fully-cured, and some aint worth a damn if they get frozen after being-cured, too.
A spare bolt, complete with firing pin, extractor, spring and pin, ejector, gas rings, etc, will fit in the pistol grip of an AR. That's all I bother with, but then I'm a world class pistol shottist, who advocates the carrying of a pair of pistols, one of which is a canned .22lr, as well as avoiding open country in daylight, having a.22 unit for the AR, having a can on the AR, etc. In others, needing to fire less than 10% as many rds as bozos who dont know to use such precautions.