You can quite see why the ATF have an issue with auto/safety Sear recivers. It' just way too easy to make them Rock and roll!
The ex law enforcement examples that change hands might be fine, but, could potentially get you a prison sentence if some officious little Hitler decided to nail you to the wall and declare it a Class 3 firearm.
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Just a superb rifle Gil, only with the adoption of the L119 7.62mm AR have the army had a comparable rifle.
I had a chat with a guy who carried one in Afghanistan, he couldn't praise it enough.