About 6 months ago I asked for advice on which gen G-19 to buy. For a number of reasons, including the introduction of the MOS series, I will probably be getting a gen 4 G-19 MOS. I would like to hear from folks who have an MOS series Glock and which optic they mounted. This will be used for range, HD and possibly carry. I would also prefer to spend about half the firearm price for the optic rather than as much as the gun cost (or more). Also, despite my screen name, I am no longer in Mass, having escaped about 16 months ago. I appreciate and look forward to all replies.