Holosun K-series footprint standard

What does a "red dot footprint" mean? The term footprint refers to a sctructure of the sockets and screw holes on the base of the optic device.
And what does it mean if the footprints are compatible?
Each optic sight has some base for mounting. The base consists of pins on various positions and holes for screws used for fixation of the sight to the adapter plate or mount. If any two sights use the same base for mounting, we call that that they share the same footprint.
In this article we show which red dot sights share the same footprint.
The K-series red dot footprint is a modification of the Shield RMSc standard. Compared to the Shield standard, the K-serie does not have the sockets in the back of the device, and also the front sockets are sligthly less deeep. That means that to accomodate the red dot to Shield standard you would need to cut the rear pins and shorten the front pins.
Modification however bears another risks - you may damage the mount. Also you will lose the warranty for such mount due to the modification. For that reason we cover the K-series footprint as a separate mounting standard instead of the Shield RMSc standard.
The Holosun K-series pattern consists of two sockets in the front corners of the front of the sight and of two screw holes in the rear of the sight.
The front socketes are 17mm / 0.66 inches far from each other. Position of these two sockets corresponds to position of pins that are on a mounting surface of any mount for this standard.
The screw holes are positioned in the rear part of the optic device. These function for fixation of the sight to the mounts. These two screw holes are 14mm / 0.55 inches far from each other.
The screws that are to be used for these screw holes are always included in the package with the sight.