Sig romeo1 RDS on glock 19 MOS. Sig provides 2 adapter plates for the most common factory optic milled slide, glock MOS and S&W CORE. And a slew of dovetail adapters for just about everything. HUGE field of view. Does not feel as rugged as a RMR. So no racking slide via optic unless absolutely necessary. It saves battery with sig motac, motion activated off and back on without pushing any buttons. The base is flush on a glock slide but objective flares out, allowing a bigger window. But the big innovation is...the notched rear, so no rear sight needed to co-witness. I'm blabbing. More when mounted on a M&P CORE.
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