1911-yes because it is bottom fed, with a top ejector
rifle-yes because see above.
ar-from the pic i call BS. you can clearly see the belt going into the ejection port, with no actual ejection port on the other side, now the way the gas piston works, it could not eject the round through the bottom, because it would drop the belt instantly, it would HAVE to have some type of ejection port on on the left hand side to feed the belt of spent casings through. good idea.....but the photo is phony ;-)