OK, first of all, this guy needs to be taken out.
Second, I don't think he's all that good in the first place. To guess, he has limited military training. To snipe anyone from 30meters to 150meters is very easy. A .223 cal or 5.56mm NATO round fired from assorted types of rifles, can accuratly hit from 700-900meters.
Which brings up another point, people keep on talking about .223 cal bullet can't be effective over....meters.
Ummm...much depends on what fires that round. The russian VEPR has low recoil, is quiet (reletively speaking), and is very accurate. Also not that expensive.
Though, if i were to guess, 'crazy' is using a M96 or something close to that. Made the same as the C7 and M16, reliable and very accurate. heres the real kicker, AVAILABLE to U.S. Citizens for only $1500.
And the 'tumble' effect after the bullets stops spinning, can cause more damage cause it rips thru the body.
On a side note, he/she seems to be well planned, as far as escape routes go.
Well now that U.S Armed forces and planes are being deployed, hopefully he'll be caught.
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