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Yes, the Trijicon RMR HD 1x Reflex Red Dot Sight is compatible with your 509c Tactical pistol. Your FN included adapter plates to mount different optics, you will need to use the #2 MRD plate 502 with the 506 MRD insert to install this optic.
The WCP320 Carry does not come optics ready from the manufacturer. You would need to use an adapter plate that replaces your rear sight with an RMR plate. The Evolution Gun Works Trijicon RMR Sight Mount will be compatible with the WCP320 Carry and allow you to install this optic. The adapter plate can be found by using the link below:
https://www.opticsplanet.com/evolution-gun-works-trijicon-rmr-sight-mount-1-780-in-aluminum.html
Unfortunately, the Trijicon RMR HD 1x Reflex Red Dot Sight is not compatible with the M17. The Trijicon RMR HD uses the RMR footprint, while the M17 is designed to accept optics that use the Deltapoint Pro footprint. You will be able to fit optics such as the Sig Romeo 1 Pro, Eotech EFLX, Holosun EPS, Holosun SCS-320, SIg Romeo M17 and more.
you'd have to get an rmr adapter plate. Google vp9sk adapter plates
you'd have to check with walther. they usually send your first adapter plate for free with proof of your walther purchase
It can be changed to either the dot or the dot with the 55moa circle
The Trijicon RMR HD 1x Reflex Red Dot Sight is compatible with the Glock 45 MOS. Using adapter plate #2 included with your Glock, you will be able to install this optic.
The Trijicon RMR HD 1x Reflex Red Dot Sight is not compatible with a Glock 43X or P365 X-Macro. Please email us at Techsales@opticsplanet.com for assistance in mounting an optic to your pistols.
The Trijicon RMR HD 1x Reflex Red Dot Sight does not have an auto-on or auto-off feature. However, it does have a reset timer. The reset timer works by automatically adjusting the brightness of the dot to match current lighting conditions after 16 hours of no button pushes. This will help to conserve the battery.
The Trijicon RMR HD will be compatible with your Glock 40 MOS pistol. Your Glock included 4 adapter plates to mount different optics. Using the #2 adapter plate (Trijicon RMR) you will be able to install this optic.