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Hi OP: Like you, I encountered the same problem after replacing the stock 5 round mag with a 7 round Freedom Fighter Tactical mag. It really is ammunition manufacture dependent, because not all shot shells are the same “exact” length. Even individual shells (by the same manufacturer) can vary. So, here’s how I fixed it (there is no “replacement” mag cap “modification” that I know of, BTW). There are essentially 2 springs for the Benelli, “long” and “short” (count the coils, don’t measure how long it is). The long spring takes up more room in the tube. The “short” spring (which comes with the 5 round) takes up less. I use the “short” spring. Then, if you remove the srew-on mag cap, you will see a snap ring “cap” or “seat” (don’t remember the part name) that retains the mag spring in the tube. This “seat” is NOT indexed to the tube, meaning it can be seated deeply or at the very end of the tube and can be moved in or out. Using snap ring pliers, you can “back” this seat out some (it’s about 3/4 of an inch long). You DON’T need to back it out much, just enough so you see the end of it outside the tube (about 1/16 to 1/8 of an inch, if necessary). BE WARNED, backing it out too much will cause it to violently fly out of the end of the tube when you release compression, then you need to go looking for it (good luck with that, BTW). My seat is about 1/16 of an inch outside the tube. Those two together “fixed” the 7 round “problem” for me. I use Hornaday “Critical Defense” 00-BUCK (2 3/4). Last thing - and this is also important - if you shoot your gun at the range, MAKE SURE you occasionally crank down on the mag cap until it clicks. The cap has a tendency to loosen when shooting many rounds. I’m not sure if the cap actually retains the end of the “seat,” but I don’t chance it. Hope this helps. Good luck!

Jolly Roger, thanks bud, lol. I somehow have to threads going on this. Just to be clear, it's a stock LE model that is supposed to hold 7 from the get go. Don't want to mess up a $1700 piece of machinery. I'm using LE rounds of slugs and 00 buck, but that shouldn't matter. Also Winchester Super X slugs. The mag should account for the size differences, or not advertise it as a 7 rounder. Thanks again.