There are a few mounts available on the internet but having the right match is critical when purchasing a tactical shotty. I have the Berreta 1301 and they make a couple mounts for that gun but the scope selection is limited for those mounts.
Good luck.
https://www.aridusindustries.com/
I just took mine to the range in Mardela springs yesterday and she’s a mule with the slug. Ran about 30 slug and over 120 bird shot through and I’m sore as all. Optics are essential on a tactical platform and the 1301 T is lethal at 50- 100 yards, yes 100 effectively as I have the paper to prove...