are you brain damaged? Where are we? Warlords?the scoped M4 will hit more prairie dogs than miss at 200 yds. ditto crows at 150 yds, and again, the silencer lets you take repeat shots, quite often. The M4 expands varmint type sp's just fine to 250 yds, taking coyotes. It will also take deer and hogs very nicely, to 150 yds, using a deep penetrating sp, like the Nosler partition.
the 11.5" barreled AR, with 7.5" of silencer, is a handy assembly. No silenced 308 is handy. The 11" AR can be taken down and concealed in a pack, attache case, gym bag, grocery sack, or even, with mods, under normal clohthing. So you can get into place, whack a warlord and leave again, looking like everyone else, and do so silently, with no flash at night. no 308 offers you this ability
Which movie are we in? The Postman? Waterworld? Mad Max? The three Stooges go to Mars?