I have a 410 with modified and full chokes, the threads are on the outside of the barrel. Anyone know of a person or place that can make an extra full choke for it?

They have modified and full in stock.

https://www.havlinsales.com/

I have both of those that came with the gun. Was hoping someone could make an extra full choke.

Killed my first squirrel with one of those. Good old guns.

Contact Vic Havlin. If anyone has them or makes them, Vic would know. Vic is sort of like the Rosettta Stone of anything/everything Mossberg.

Thanks, I just emailed them. Will update here with the reply.

They replied back. It would be a one off custom and cost more than the gun is worth. I pretty well figured that so I'll just have to make do with what I have.

Got one of them too.
My two tubes are full and modified.
Very good friend gave it to me after shoulder replacement surgery. I bought $60 (10 rounds) worth of Federals 3" #9TSS ammo specifically to hunt turkeys with. I haven't shot a turkey with it yet, but if I live long enough, some tom turkey somewhere is leading a charmed life and just doesn't know it! LOL!
I looked at the .410 S×S offered by Academy. A really cheesy looking gun.

Have you patterned it yet? I'd be happy if TSS would make good 30-35 yard shots. Anything past 20 yards is a gamble with regular lead shot I've tried on squirrels.

I bit the bullet and burned up two of those $6 shotgun shells. Ten and 20 yards with the full choke tube did just fine.
I would feel just as easy using lead 8's or 9's, I just can't find them on 3 inch. The TSS is harder. Harder doesn't necessarily equate to deeper penetration.
I bought the Fed .410 TSS kinda out of desperation, thinking it would be "more effective".
It's only "more expensive".

Whole thing in a "nutshell".
Expensive, dedicated turkey ammo is a ruse.
John Q. Public think if they buy "Whomper Stomper-Non Toxic-#3's" in 3.5" 12 gauge, they can easily kill turkeys at 70 yards and will burn up a hundred dollars worth of the over priced crap trying to repeat Billy Bob Gunwriter's claim the stuff is worth fifteen bucks a round.

The very first gobbler I picked up fell to a 1 1/8 oz load of #8's at 1250 fps.
Other that a few birds I've taken with a rifle and a handgun, everyone was taken with plain Jane #8's.

Remember, the target on a turkey is from where his wattles start to his head.
No matter HOW bad or how handsome that bird is, HE'S GOT TO BE IN RANGE!
Expensive, specialty ammo IS NOT the answer.

That's my soapbox.

I think the TSS will work fine, but even I won't push it to 30 yards, regardless of what Phil Bourjaily writes.

If you have just GOT to shoot turkeys beyond 40/45 yards, use a .22 Mag or .22 Hornet. Both work fine. The Hornet out to about 150 yards. Ask me.

We can't use a rifle here. I would be satisfied with 30-35 yards. Lots of guys here are shooting to 40 yards with an extra full choke and #9 TSS with great success.

4570fan, if you're comfortable with it, go for it!
Far be it from me to tell a shotgunner what he should/shouldn't do.

Some gun writers are saying with the Fed #9 TSS ammo, that the .410 is an effective 40 yard turkey gun.
Will the .410 kill a turkey at 40 yards?
I don't doubt it. Anything is possible.
...but why?

P.S. - I'd be more impressed with a hunter that called a turkey within ten yards and took it with a .410, 2.5" #9's.
But that's just me! LOL!

P.P S. - Oklahoma only allows rifles/handguns in the fall season. The fall gun season is only 9 days.