Quoted:
I really like the look of a nice 24" freefloating scoped sniper AR, but I have read that the .223 isn't the best long range round.
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The .223 is OK for paper at long ranges but isn't likely to kill at extended distances.
Course cops can't really make a case for killing someone at 1000 yards unless they're are mind readers.
"God, green light"
"Roger Six"
BANG!
"Damn, he surrendered."
SPLAT!
"Double damn"
But, as for the [b]merits[/b] of the AR as a sniper's rifle you can list;
Low recoil for fast follow up shots.
Self loading for the same reason.
Doesn't automatically mark the bearer as a "sniper" like a 26" barrelled bolt gun does.
Convertible configs by switching uppers, like a suppressed unit or a rimfire for taking out lights.
Easily suppressed with a muzzle can and subsonic ammo for dogs and such.
Most likely cheaper.
Lighter.
Most cops are already familiar with the M16.
Less penetrative than .308, but still works well on body armor.
More frangible, important in richochet prone areas.
All this, [b]inside[/b] 100 yards of course.
I think I'll still be dragging my 700P tho with my 16" barrelled, folding stocked, flash suppressed, bayonet mounted, twelve shot, Ishapore Enfield .308 in the trunk.
Why? Because .308 API-T beats .223 AP in every way. [;D]