Any suggestions for
1. Tube extention
2. Flashlight mount
3. Side saddle
4. QD sling mounts
5. Possibly a pic rail
I realize it's your gun and you can do anything you want with it, but I wonder why you want a bunch of tacticool accessories on one of the best out-of-the-box competition shotguns. IMO put a Nordic tube on it and forget the rest for the 1301 Tacs.
What's the difference between the s&j one and the Nordic one? Besides the price?
...Some type of belt-mounted caddy for reloading from is my choice over a gun-mounted shell holder. I get the idea behind having reloads on the gun, but for my use it's too slow.
S&J is steel and a defined length, and the Nordic is aluminum and somewhat lego-ish. For the Nordic you need to buy a nut/adapter to fit your shotgun that replaces your factory magazine cap, you then buy a tube of varying lengths to thread into that. Both are very high quality, but different enough to be unique.