Take a common hunting rifle, say, a .308 caliber Remington 700 bolt-action rifle. Nothing suspicious at all about it.
It is also one of the most feared classes of weapon on the planet, short of a freaking cruise missile. Nothing scares the pants off of professional militaries the world over more than the thought that their officers could just DIE with no warning whatsoever. We're talking 800+ yard range in the hands of a good shot, and the .308/7.62 NATO is a common military round, as well. When you factor in the common combination of woods/fields/urban environments commonly found in the U.S., the "hunting rifle" becomes an object of sheer, pants-wetting terror. You can't return fire on a target you can't even see.
By the way...
$120 for a Mosin-Nagant, probably two or three hundred more to have it gunsmithed to fit an old-style Soviet sniper scope. Or, you could just remove the rear sight and fix a long-eye relief pistol scope to it instead. Instant medium-range sniper for two hundred bucks.
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