Hey All,
I am having the same issue with my M2 as well.
I have shot a many of shotgun in my 53 years of life and have never got bit like this.
On the other hand I think that in the heat of shooting duck that i might be loosening my grip a little and getting bit in the process.
I am still looking for a fix on this due to i have hurt my hand back in 93 and getting bit like this doesn't help at all.
Right now the only potion i have came up with is to learn how to shoot left handed.?
Also will wait to see what Benelli has to say as well.
Thanks
Steve