Action Army T11, A&K m24, or CYMA VSR-10 (or any VSR-10 for that matter)
I am not giving you Amazon links as Amazon is pretty shit for airsoft guns. (Their policies concerning airsoft guns are pretty ass, and you will likely NOT get a refund and you have to pay restocking fees usually. I should know, dealt with that 7 times.) Their selection is pretty bad too.
A&K US Army SOCOM Type M24 Airsoft Bolt Action Scout Sniper Rifle w/ Fluted Barrel, Airsoft Guns, Shop By Rifle Models, M700 / M24 / M40 / VSR10 - Evike.com Airsoft Superstore
Action Army T11 Airsoft Bolt Action Sniper Rifle (Model: Full Length), Airsoft Guns, Shop By Rifle Models, M700 / M24 / M40 / VSR10 - Evike.com Airsoft Superstore
CYMA Standard VSR-10 Bolt Action Airsoft Sniper Rifle (Color: Black w/ Scope Rail), Airsoft Guns, Airsoft Sniper Rifles - Evike.com Airsoft Superstore
I HIGHLY doubt that, cops care way more about airsoft guns, as they look like the real thing. Most people are too stupid to look for the orange tip, and most people tend to remove those anyway.