Triggerfinger notes that pending legislation in Maine provides for the confiscation (without compensation) of .50 caliber rifles. But reading the text of the bill shows that they actually plan to confiscate all guns that fit their broad definition of "assault weapon".

Any machine gun, assault weapon or .50 caliber rifle or .50 caliber ammunition possessed in violation of section 1051 or section 1058 is declared to be contraband and is subject to forfeiture to the State.

Of course "assault weapon" is an arbitrary term created to include scary looking guns. That is, guns that are not machine guns, but look kinda like them.

(Via Say Uncle)