I just ordered an Optima mount from EGW for my 22/45. I have tried EGW mounts on my two Kimbers and my Springfield HiCap. (I have since had EGW convert my HiCap to the Optima Cut, whcih can't be done on 22/45)
The mount is only $40 and available in blue or silver.
www.egw-guns.com