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Willie Lowman · July 13, 2014, 06:48 PM

The FN SCAR HAMR IAR was said to automatically switch from closed bolt to open bolt operation when the barrel heated up. I have never found out what mechanism caused this to happen or at what temperature the change from closed to open happened.

July 13, 2014, 06:48 PM	#29
Willie Lowman Senior Member Join Date: March 5, 2009 Location: Uh-Hi-O Posts: 3,006	The FN SCAR HAMR IAR was said to automatically switch from closed bolt to open bolt operation when the barrel heated up. I have never found out what mechanism caused this to happen or at what temperature the change from closed to open happened.