Mounted once but never ran, like new, Ultradyne C4 Offset Folding Sight System. Really well built Irons. Currently these are running $333 for the pair. Cool concept and probably more accurate, further out, than the red dot you're running.
Less than half off and a steal at $150 Shipped. Zelle or PP
https://ultradyneusa.com/product/c4-offset-folding-front-and-rear-sight-rh-combo-picatinny-mount/
Less than half off and a steal at $150 Shipped. Zelle or PP
https://ultradyneusa.com/product/c4-offset-folding-front-and-rear-sight-rh-combo-picatinny-mount/