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Gotta get off your wallet! https://www.gunbroker.com/item/1068350053

Given that the sights are above the bore axis the projectile comes up to meet the line of sight (see the bore axis in the picture) at 2 distances (in your case first at 15 yards) then as gravity takes over the projectile starts to drop to cross the line of sight at some greater distance. Extend your target out to 75-100 yards and you will find that the slug does intersect, then fall below, your sight picture some where beyond 50 yards.

Does anyone have any experience with Dave's Metal Works Magazine Springs? He included one with every extension he sold. I have one I bought 2nd hand that included the spring, and it is the FIRST time I've seen a flat wire spring for the benelli M4! It reminds me a little of Tubb's Flatwire AR buffer spring. IT measures around 28" long and seems to have decent tension to it. I emailed Dave about it and he described it as follows, Not sure what "Rocket Wire is", but it sure sounds high tech. When fully compressed, there is actually a hair more space in the tube to load rounds than the sorter factory spring when compressed. Was trying to look up first hand user accounts of it and someone posted that he bought the extension and used the spring, and that the spring was "junk" and started giving him cycling problems after a time. Didn't check the date of the post, so not sure how old it is. If anything, I would think that a spring like this would function better! Does anyone have any experience with this spring or know anything about rocket wire? I think it's cool that there is actually a flatwire mag spring available for the benelli m4!

Mag capacity.

Further elaboration from Dave.

So I literally had the same issue today when trying to install my new Mesa tactical buttStock onto my Benelli M2. I Went online and couldn’t find any videos or any information. I called Mesa tactical directly and I spoke with somebody named Ryan in technical support. He told me that during the development of the buttstock that the Benelli‘s they used to design it did not have a wider ring beneath the threads of the shaft that’s inside the buttstock. He told me I could use either a file or a drill bit to widen the little plastic plug inside the Mesa Tactical butt stock, and that it would slide over. Unfortunately Mesa tactical also forgot to include the steel oval washer in the kit I purchased. Ryan was helpful enough to take my address and he’ll be sending that to me. It seems like they’re making this more of an issue online by not being more open and forthright about their products or issues. Mesa should address this a little better instead of customers having to shell out $150 and then figure it out on their own.

During my exhaustive search I was unable to find any threads or videos specifically geared towards the mesa tactical urbino pistol grip stock and the Benelli M2. So it is my hope this thread helps someone in the future, should they encounter the same problems. The long story short, I don’t know if it was an out of spec issue with the urbino stock or a dimensional part change with Benelli. The issue was resolved by drilling the plastic cup mount inside the stock and the provided large oval steel washer to a slightly larger diameter and that allowed the recoil tube and threaded shaft to fully seat in the stock. Otherwise it was physically impossible to install the stock without this small modification. Thank you