Great sight, nice fit. - Viridian Universal Sub-Compact ECR Green Laser Sight

This is my second purchase of the same model meaning my expectations were met....Mounts tight, even with the ruggedness of concealed carry, the sight remains intact at zero.. Visible even daytime. And nightime serves as a guide and illuminator as well. The battery should last for 2 hours with continuous on but not in my case.
I would turn it on for a second each day for test and a month and a half after, the battery needs replacement.