I curious as to the barrel and choke work you had done. Did the installation of the mod choke improve your patterns enough to justify the cost of the modification? And did the forcing cone work reduce the recoil any appreciable amount?
Glad the NOB is working for you.
I like Modified choke and run one in all of shotguns with choke tubes. I get the best patterns with all types of buckshot using a modified choke. The barrel work only cost $100 total with shipping included there and back. Money well spent.
When I have choke tubes install again on one of my shotguns I will have Tru-Choke installed instead of Acc-Choke. The AC thinned the muzzle out quite a bit. I specified I wanted AC installed. The SPX barrel is close to the borderline as to where it can have AC tubes installed. That is one reason why I use a extended tube to protect the muzzle. It is not a bad idea to use a extended choke anyway to protect the muzzle on a choked tactical shotgun. The colonial Arms tube only extends 1/4" which is perfect.
The cone did lesson recoil a little and my patterns did import but I don't know if it was from the cone work or the choke. It was probably both. What did improve was reliability with cheap ammo. I was having problems with some shells not ejecting because they were sticking in the chamber. After the cone work that all went away. I believe the chamber on some 930 shotguns are a little tight and or rough. When Mike did the cone work he also polished it and the chamber very smooth. Now my SPX feeds very reliably with all types of ammo.
Do you think the tie wrap will be able withstand the heat of the barrel during extended shooting? Guess I'm thinking it might melt or weaken. Do you think it would work on the tactical model with the breacher barrel?
Only time will tell if the zip tie will hold up or not. The barrel would have to get very hot to melt it but I believe it is possible. If it doesn't hold up I will make a bracket for it. I know one thing, zip ties are very strong, have you ever tried to snap one.
A heat shield would look good on a 930 breacher and fit well.
While that looks OK, I like the Mossberg factory heat shield. IMO, it is the best one out there.
You are right the Mossberg HS is a very good shield but it is made of steel and will heat up along with the barrel. Also if you are in the hot sun it will be worthless. I prefer fiberglass heat shields because they work much better.