I have a Benelli Tactical M2, 18.5 Barrel with the factory +2 tube extension. I would like to install a Nordic Components Plus 4 Magazine Tube Extension. Will this Nordic extension extend beyone the end of the barrel? Also, I will need a replacement sling plate to be mounted below the Nordic tube. I want to keep the original factory +2 extension intact. Can anyone recommend a sling plate that can be used with the Nordic Component tube. Thank you again for your input.