How much money do you have?
There are Synthetic Stock & Fore-Ends, lasers, red dots etc. You can Google it.
When I had my 1100 I just left it in the bedroom with my 21" smooth bore deer barrel - which I used for deer hunting - and loaded it with 00buck. I took out the plug - 5 rounds seemed enough for me. The 21 inch deer barrel made it easier to get around the house with than my 30" trap barrel.
The Tactical has an 18" barrel but I don't believe it is interchangeable. So your only talking 3" anyway.
The BG won't care if you have a walnut stock & fore-end. His attention I'm sure will be focused on the big hole facing him.
I'm not much of a Tactical gadget guy so the only thing I could think of that could be an advantage would be a flashlight mount since both hands will be occupied.