The STANAG rings on MJ1s IWS bracket are by A.R.M.S. for those interested.
Hellacious price for investment cast rings that may not even have the inside machined.
Still, at least you don't have to bend the damn things to put them on like the EAW "8 o'clock to four o'clock" rings.
Probably best to buy a set of high rings with some extra meat on them and machine the "peg" on yourself, drill & tap 1/4" NC and call it good.