I had got some 22.5mm lenses from Frei and Borel, Inc. and found a very small looseness in the fit in the AA minimags.
I am inclined to get the 22.6 the next time.
This is a great cheap mod along with the opalec newbeam - just about a perfect light... no lens scratches, no bulb replacement, long battery life, constant light output and red light warning when the batteries need replacing.