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Don't know what sort they are. It was a long time ago.
Gave it to Din and asked for express sights. The back sight folds.

Here's my one. Haven't fired it for a while but it will put a slug from each barrel 2 inches apart at 60 yds. 20 in barrels.

https://i.ibb.co/ZKLr0nW/sh002.jpg

Yeah used the gun club ammo too. They will go right through a goats backbone at 60 yds.
Got a sxs shortened by 6in and express sights.
Poor mans double rifle.

I used a lee mold they have a bar across the inside of them. Just carefully cut the top off a shell and pour the shot out and poke the slug in the cup.
If you dont cut too much off you can roll...