Worked perfect with correct mounting screws

I followed the manufactures instructions in installing the filler plate. After firing 150 rounds, the Holosun 507 comp optic began to loosen. I then disassembled the optic and slide and examined the filler plate in relation to the slide. I found that there was a little gap that would allow the filler plate to slide front to back during recoil. I then used a needle nose plier to bend the front lip of the filler plate until it would fit onto the pistol slide snuggly without movement. I then reassembled the optic, using medium grade Loctite on the mounting screws. So far the screws have maintained their position without loosening.I then reassembled the optic, using medium grade Loctite on the mounting screws and if so far the screws have maintained their position without loosening. I don’t know whether it was a manufacturers error, or if my particular pistol slide had a longer optic mounting base.

Timely delivery good price and great service

Sig P320 Filler Plate for Romeo 1 Pro Slides that have RMR Holes and do or don't have Rear Dovetail Sights Attached to slide - SGRX-RSH-FIL