Sory it took so long but i just saw this. Been really busy lately.
It's not an easy task to put a factory adjustable vent rib sight on a gun that came with pistol sights. Maybe on a 410 if you have an ancient one like mine that came with the full un-adjustable rib...
Problem is, the gas block is not thick enough to thread for the stud needed to secure the front and put the adjustment wheel on.
Then if you were to try and weld it on, the stud is very short and you would have to cover some of the threads at the bottom with your weld, greatly limiting adjustment. That's why you don't see p