I mailed my certificate on 30 NOV 2018, didn't receive any acknowledgement from Glock, finally decided a couple of days ago to ask for a status. I received an email today saying it had been shipped on 4 JAN! Never got a tracking number from Glock nor a call from my FFL, bit torqued about that, even more so for the transfer fee of $50 including the FLEC fee here in Florida. I have a Burris Fastfire III on hand but doesn't look like either of the Glock mounts fit it... another $50 for the Burris mount but they list two mounts for Glocks and unsure which to use for the MOS system. Have inquired Burris about that. Anyone using a Fastfire on a MOS?