Steve Rose

And yet another https://www.speedshooter.com/product/dmw-benelli-speedbar/

Here's another version https://cpwsa.com/product/benelli-carrier-rapid-release-tab/

Install the shims that will add more “drop” to the stock, that lowers the end of the stock helping you look down the rib instead of seeing rib. The higher the number on the shim the greater the “drop” distance of your stock fit. Think of the recoil pad end of the stock as a rear sight. When making sight in adjustments you move the “rear sight” the direction you want to move the point of impact on the target.

The fine thread tube is the early version, serial numbers below M155400

I have stippled the stock (grip area) and the forearm on a few Nova guns. All those “ribs” you see got the usual wood burning tool treatment. If you've done a Glock you can do this.

Show us the end of the magazine tube (without the mag tube cap screwed into place). Is anything sticking out past the end of the gun's magazine tube?

Numrich Gun Parts has some in stock

Push the barrel down and tighten the magazine cap.

@remarkable You knew where I was going with the model # question.😉 Why Benelli choose to make a 3” AND a 3.5” SBE3 when they already have a 3” M2 is something I don't understand ...but I've been tinkering with Italian shotguns long enough to know they do what they want to do and tell us Americans we will like it.

On the box or some of the Benelli paperwork that came with the gun.

@misslebait Which model # SBE3 do you have?

At one time Benelli sent their Performance Shop guns to various stateside gunsmiths for the “enchantments” (and as far as I know they still do). The hunting guns go to a well known shop that advertises a lengthened forcing cone as part of the package. Your chamber looks like the FC reamer may have slightly touched the edge of the chamber while in use. The good new is that little scoring mark will have zero effect on the shotgun's operation.

That sounds exactly like a weak magazine spring and/or debris hanging up the follower. If by chance you are using a magazine extension tube you need more spring pressure and make sure the spring/follower is not hanging up on the junction of the factory tube and extension. Look up “shell surge” ...the situation where the shell in the magazine tube move forward under recoil. If this is happening the bolt may also lock back with shells still in the mag tube. Other than this I don't have anything more for you. You may need to get your SBE3 to a gunsmith familiar with the Benelli action.

When the hammer falls (whether firing the gun with live ammo, or dry firing on an empty chamber) does a shell exit the magazine tube? One more thing...and you probably know this but some don't.... the Benelli will NOT let a shell out of the magazine tube by just be opening the bolt. The cartridge drop has to be activated which only happen when the hammer falls or you manually active the lever.

With the bolt closed on an empty chamber and shells in the magazine tube will a shell exit the magazine tube when you active the cartridge drop lever (tab on the side of the trigger group)? When you cleaned it did you also clean the inside of the magazine tube and the follower?