I used two of https://www.amazon.com/gp/product/B083SJD418/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 to make “crosshairs” for my K40.
To align, use a test fire create a dot, then just rotate the lasers until the cross at the dot.
The author hasn't provided the model origin yet.