If you are talking about the micra with the twisty tail cap, the ripoffs CO-37 holster should fit great. I do not have a micra, but the spec sheet lists the length with the twisty as 3.2 inches. The same as the Arc LS series with the clicky tail pack. My LSL fits perfectly in the CO-37 holster with a little room to spare, but not much. So, the micra should fit the same. What I would like to know is if any has the CO-37 and the micra with the clicky switch. Does the added length of the click make the micra to long for the CO-37 holster?