Some info about the Rem 5 MM rimfire round is at www.aguilaammo.com
CZ may be makeing a rifle for the 5 MM rimfire round. Remington made a Mdl 591 and 592 bolt action rifles years ago . There are a lot of 17 HM2 fans at www.rimfirecentral.com
so it will be around for some time. Eley and CCI are makeing 17 HM2 ammo but some of the firearms manufactors have stopped makeing the 17 HM2 rifles.