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Hi David and welcome. thread pitch is 1/2 x 28 tpi and eceiver is dovetailed so you'd want to use the adapter below to convert to a piccatinny rail to mount a scope or Red dot. budsgunshop.com/product_info.php/products_id/132553/ncstar+adapter+3+8+dovetail+to+picatinny+rail+black />
This Rossi model has a Dovetailed receiver so you'd want to use the adapter below to mount a scope or Red Dot. The TPI is 1/2×28. This receiver is dovetailed so you'd want to use the adapter below to convert to a piccatinny rail to mount a scope or Red dot. budsgunshop.com/product_info.php/products_id/132553/ncstar+adapter+3+8+dovetail+to+picatinny+rail+black />
Hi David, the barrel is threaded 1/2 x 28 You need a dovetail to picatinny adapter for a scope/optic. I used this one on my Rossi >>> https://www.amazon.com/gp/product/B01ABW7GS0/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 , Stay safe & have a great day!