This original mounting plate is intended for attaching the Holosun HE509T collimator to pistols using the Glock MOS modular optical system. The high-quality steel plate is also compatible with other collimators, the assembly of which is identical to the assembly of the HE509T model.
The adapter for the Holosun HE509T is intended for direct installation of the collimator on the bolt carrier of a 9 mm / .40 caliber pistol with a MOS modular optical system using the supplied screws. After installing the plate, you simply attach your collimator to it.