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Maybe I am missing something, but to my knowlede, the difference in the two platforms sight height wouldn't allow for this. Typical AR platform height for absolute cowitness is 36mm or 1.4 inches. Not 100% sure on the height of the M4 cowitness, but the Scalarworks mount I have for an Aimpoint T2, that allows for a lower 1/8th is a pretty low mount and is made exclusively for the M4. Not sure how what you want would be possible (without a completely custom setup) but I have been wrong before.

Thanks again all. The tap did go in quite easily once I got over the initial resistance - there were a couple of tighter spots but it was all easily done by hand. I expect anytime it was a little tighter it was cleaning the existing threads up. It definitely cleaned out well and completely aligned to the original threads. I was also able to run the receiver tube thru a matched thread cleanup which i think was also important to ensure i didn’t repeat my mistakes. Thanks for the recommendation on alumablack - i didn’t even know that was a thing and I’ve got a bottle on the way.

A inquiry like that is best made by going to the source, suggest you contact Benelli for the most accurate info.

I took my m2 out for the first time and nearly every round got stuck and wouldn’t eject. I had to manually remove the expended shell. I shot buck shot about 1250 fps. Any one know what I should be sooting so this is actually a semi automatic shotgun?