Best red dot i have used on my 10mm pistol - Vortex Defender-CCW 1x25mm Reflex Red Dot Sight

I have shot over 500 rounds from my 10MM M&P 2 Smith & Wesson with no issues from the Defender CCW optic it did not even loosen up the factory (blue color) thread locker that was on the screws provided with the optic. The red dot comes mounted on a Picatinny Rail Mount which will have to be removed if you're not going to use on a rifle or shotgun. I might use it as my 45 degree off set sight on my rifle. The battery is the common CR1632 which is the same as my other optics. For the price you get your money’s worth as the optic packaging includes a dusk cover for the red dot, a 2 in 1 tool for the screws & batterie cover, and several different screw lengths to fit the following: SIG P365XL, Hellcat, XDM 5.25OSP, Glock MOS, FN-509, Canik TPSFX; Canik TP9SC; Canik Rival; Canik TP9METE; Canik METE MC9, Sig 320; M17; M18, CZP10, HK Vp9 tactical, Kimber AEGIS/KHX custom.