kasaran

What did you measure it with? Reason I ask is those measurements don't line up with metric standards. It's also not imperial standard (usually 1/64th's).

Imperial would be 1/16 x 19/32 (1.587mm x 15.081mm). But that gets factored back into metric for most sites and is sold as a 1.6mm x 15.1mm

You can find rings done to 1/128th's In that case it's closer to a 9/128 x 19/32 (1.78 x 15.081mm) sold as 1.8x15.1mm. Not common at all, but you can import them. I'd measure twice to be absolutely sure that is the dimensions you need.

https://www.ebay.co.uk/itm/383165765183?chn=ps&mkevt=1&mkcid=28

the measurements came from this guy https://arniesairsoft.co.uk/forums/index.php?/topic/218851-raptor-mp-443-pya-grach/  and curious if i can replicate his results