Re: my U.S. military collection...
The russians did some prototype M95's with a gas piston for automatic fire. You can see some similarity between the designs of the rotating bolt head with a non rotating bolt carrier between this and the russian semi auto rifles.
"Americans have the right and advantage of being armed - unlike the citizens of other countries whose governments are afraid to trust the people with arms." (James Madison, The Federalist Papers #46 at 243-244)
"I have sworn upon the altar of God eternal hostility against every form of tyranny over the mind of man."