ADE Optic Mounting Plate for Ruger 57 / Ruger 5.7 Pistol - Compatible with Trijicon RMR/SRO, RD3-019 Stingray, RD3-022 Artemis,RD3-019 Stingray,RD3-020 Raptor,RD3-023,Holosun 407C,507C,508T Red Dot

Fits like it was from the factory!!

I was trying to find a mount for my Osight from Olight for the Ruger 57 for a little while. Finding a red dot mount for the ruger 57 was hard enough as it is, but for the new Olight Osight was even harder. The pattern of the Osight is the standard RMR so this mount should work with a lot more different sights. At no fault to the mount itself the but the Ruger 57 is much more bulky with the red dot installed. Build quality is good and feels nice and solid.

Many reviews on RMR mount plate holes not matching slide threaded holes, however the one I received 10/28/24 matched perfectly to the slide and to the optic.

Would have been 5 stars except that you have to bore out one of the holes with a 5/32" drill bit because the holes don't match the factory holes. Once you bore 1 of the holes it fits perfectly fine.

Mounting holes are off!!First one didn’t fit got a replacement same problem. ADE customer service didn’t care to fix the issue. Simply said the plate doesn't work for your model?? Isn’t that what this plate is advertised for??Also to top it off included screws to mount a 508t are too long and digs into slide.

The wholes did not quite align to the pistol. I struggled to get them in as is and nearly stripped the threading. Had to ream out one of the wholes with a drill bit to be able to make it work. Would not buy again.

Had to fix the makers bad craftsmanship and after all that the gun jams after every shot. Remove the plate works fine.

This adapter plate is not fit to my new Ruger 57 pistol. The sitting cut is not accurate to meet pistol’s design.