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The x2 version addressed the lens distortion issues found on the prior version.
The Holosun HE509T X2 Enclosed Reflex Optical Red Dot Sight will not directly mount to a picatinny rail. There are mounts available specifically for the 509T that can be found by using the links below:
https://www.opticsplanet.com/reptilia-dot-mount-for-holosun-he509t.html
https://www.opticsplanet.com/american-defense-manufacturing-holosun-509t-qd-mount.html
https://www.opticsplanet.com/american-defense-manufacturing-holosun-509t-qd-mount-titanium-lever.html
No, the Holosun HE509T X2 Enclosed Reflex Optical Red Dot Sight uses a proprietary footprint, not compatible with ACRO mounts. Included with the 509T is an RMR adapter plate, allowing it to be installed on RMR cut slides.
Yes, the Holosun HE509T X2 Enclosed Reflex Optical Red Dot Sight includes an RMR adapter plate that installs to an RMR cut slide, which then allows you mount the 509T to the plate.
The Holosun HE509T X2 Enclosed Reflex Optical Red Dot Sight can be mounted to and FNX-45 Tactical. To do so, you can use the RMR adapter plate included with your FN and mount it to your slide, you can then use the RMR adapter plate included with the 509T to then mount the optic. The downside of this method is that you will be stacking 2 adapter plates and adding additional height to the optic. The other method, in which I would recommend, is to purchase and install the C&H Precision FNX-45 to 509T adapter plate. This plate will mount directly to your slide and allow you to mount the 509T without the need for stacking adapter plates and it includes the correct screws required for installation. Unfortunately, we do not carry that specific plate, but it can be found on the C&H website linked below:
https://chpws.com/product/fnx-45-to-holosun-509t-steel/
The Holosun HE509T X2 Enclosed Reflex Optical Red Dot Sight will fit the P320 XTEN via the included RMR adapter plate. It would have no issues retaining zero from the recoil on a 10mm pistol.
The Holosun HE509T X2 Enclosed Reflex Optical Red Dot Sight will not fit the Canik Rival.
The Holosun HE509T X2 Enclosed Reflex Optical Red Dot Sight includes an RMR adapter plate which can be used to install to your Shadow 2 with the use of the CZ RMR adapter plate (SKU#255).
The Holosun HE509T X2 Enclosed Reflex Optical Red Dot Sight has a compatible mounting plate that will allow it to mount using the RMR footprint. You will need an RMR mounting plate for the Ruger 5.7. However, Ruger currently only has mounting plates for the Ruger 5.7 that fit the Docter/Noblex footprint and the Shield RMS footprint. We currently do not have a mounting plate that will allow the Holosun HE509T X2 Enclosed Reflex Optical Red Dot Sight to mount to the Ruger 5.7.
In order to mount the Holosun HE509T X2 Enclosed Reflex Optical Red Dot Sight to your S&W M&P M2.0 (9mm) you would need to purchase the Evolution Gun Works Trijicon RMR Sight Mount (linked below). With that plate, you will use the included RMR adapter plate with this optic. However, as a result of having to use both adapter plates the optic will sit much higher on your slide than intended, but will still work.
https://www.opticsplanet.com/evolution-gun-works-trijicon-rmr-sight-mount-1-780-in-aluminum.html