I have to pick up my trusty Ar-15 in 5.56.

Long range capable, Nothing you cant hunt and kill with it on this continent, light weight, will shoot right up there with a good bolt gun, rapid fire capable, easy to find parts for when things start to get sloppy, tons of bullets in my pockets and mags and I can carry all the tools I could really ever need to work on one in a small bag or pack. IMHO the best weapon platform available to date.