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Hello, I'm new to the forum. I recently ( a couple of months ago) got my Benelli M4. My brother-in-law was nice enough to give me a Tacstar mag extension tube +2 for the Benelli M4. He's a dealer. I installed it. I was easy to install. I followed the simple instructions to the letter. I believe I installed it correctly. However, I noticed I can only get +1 in the tube, i.e., 6 in the tube (2 3/4 inch shells). Has this been discussed before? Am I missing something simple? It looks like the 7th shell only has about 1/8 inch or so left to go, but try as I might I cannot push it in there. The shell follower hits a stop at the end of the tube and won't go any further, so unless I do not screw it down all the way, I can't get 7 shells in there. Thanks for any help.