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For my Tanfoglio Open race gun I use the C-More red dot, with a 90 degree mount to get is as close as possible to the slide. It makes finding the red dot much easier in my opinion.
However the C-More feels a bit dated, and keeping the zero as isn’t one of its strengths. And it consumes battery like a Tesla on full speed. If I forget the battery on, it’s gone in the next hour or so.
I’ve been looking for solutions like this new product from Double Alpha Equipment, in an attempt to modernize my race gun: Find a suitable modern red dot. Find a mount.
It seems to fulfill most of my wishes (except this one is for a 2011 pistol).
The price is €109.00. If I remember correct my thumb support cost more, and this doubles as a mount.
The DAA RTS2 2011 mount is machined from solid aircraft grade aluminum to ensure long lasting durability and precision.
The mount is designed to allow just 2mm of clearance above the top of a flattened 2011 slide, so may be a tight fit if no material has been removed from the top of your slide.
The scope mounting surface includes locating pins which have been machined directly from the solid mount material to ensure precision and a perfect fit to your C-More RTS2 scope.
A compact yet functional blast shield is incorporated in the mount, to help deflect muzzle blast way from the lens of your sight.
A serrated, wide thumb paddle is included, and several mounting holes are available to allow you to position the thumb rest to best suite your preference. More than 20 height and angle combinations are possible. The thumb rest is attached using a steel pin and an M3 socket screw (included).
Or, should you not with to use a thumb rest you can certainly leave it off the mount.
The mount is designed so the scope is aligned with the center of your slide and as low down to the slide as possible. It is designed to allow a forward-positioned Slide-Racker (as supplied with the STI DVC Open guns) to fit with the mount in place, allowing the Racker to be used on the left side of the gun, as most right-handed shooters prefer.
The mounting hole pattern is the Standard C-More pattern, with a 4th hole added between the forward and middle holes.
Due to the wide variety of mounting screws and threads in use – mounting screws are not included with this mount. Use screws that fit the threads your frame already has, or as recommended by your Gunsmith when drilling and tapping your frame. We recommend the use of M4 Torx screws.
The wrong end of a 2011 race pistol. 
You can find the mount here: https://www.doublealpha.biz/daa-c-more-rts2-scope-mount
