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From what I could find it has a front sight only you can use any rear Picatinny rail mounted sight

Any standard AR rear "Flip Up" sight would work. I recommend a metal one : https://www.budsgunshop.com/catalog/product_info.php/products_id/717066978/Marflr+Ar-15+Flip+Up+Rear+Sight

You should be looking for a standard AR rear Flip Up sight.

you can use any rear Picatinny rail mounted sight