Hs507k-fn 510 red dot plate - C&H Precision Weapons Optics Adapter Plate Fn 509/510/545 V4 Mil/leo

The plate is well design well fit & finished. There is only one thing they shorted on, and that is the cutout for the o ring. The original manufacturer put the o ring cut out for a reason, and this co. redesign it, without taking into consideration the reason it was design that way in the first place. I understand it’s an easier production by cutting out a step, but for the price it should be as the original ones,as far the design is concern. At the end of the day they are not cheap$$$$$.