Have a rifle using a DD 14.5 Middy Govt Profile barrel and have using a H buffer in it since day one over two years ago with no issues to report. I also have a 14.5 BCM middy that I've been running with a H2 and cycles everything but some no name steel case someone gave me. I'm fairly certain if I used a H or Car buffer, it would cycle cause it barely missed picking up the next steel case round when I tested the rifle with it. It would be hit or miss with the H2.


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