Hey, I'm not saying that the M1 is unreliable but I am saying that inertia based designs can have some issues based on the technology. IMO gas is better. It's no coincidence that the M4, the future choice of the USMC, is gas regulated. Anything that can affect the inertia can affect cycling!
check out
http://www.snipercountry.com/roster/...duty122000.htm
and search for benelli. There's an interesting post about the benelli lifespan and side saddles and cycling.
looking for cover at this time....