I took a nice 5" M&P 2.0 in trade and shot it today. I did not check the screw that holds the battery compartment closed on the Holosun 507K X2. I must have been loose because all the sudden - no dot! The entire battery tray thing, battery and screw flew off. I found the battery and tray, but no screw thing. I'll contact Holosun support. Other than that, any thoughts on a screw I can use? Thanks.

