Holosun K-series footprint standard

Which red dots will you be able to mount on the same mount as Holosun K-series models? Will you be able to install Trijicon RMR on the same plate as K-series optics? We cover the full compatibility of Holosun K-series footprint in this article.

Footprint compatibility explained

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.

Holosun K-series footprint

And when more sight manufacturers decide to use the same red dot footprint, the red dot sights can be used on the same mount. Why? Because they use the same basis for mounting.

In this article we show which red dots share the same footprint as Holosun K-series.

Holosun K-series pattern

The K-series red dot footprint is a modification of the Shield RMS 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 RMS standard.

Holosun K-series footprint

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.

Holosun K-series footprint

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.

Holosun K-series footprint

Red dots compatible with Holosun K-series footprint

Holosun K-series footprint is shared only by few other models from Holosun production.

Below you can find complete list of red dot sights that will work with K-series red dot footprint.

Holosun 507K
Holosun 507K

List of compatible red dots

*These are having the same footprint as “holosun k series” red dot sights, but the mounting pattern is more complex. Instead of 2 sockets these use 4 sockets. The position of the sockets and the position of the screw holes is the same though. You will still be able to install these red dots to the same mounts without any modification though.

You could also use adapter plates from he k footprint of two sockets to EPS & EPS Carry footprint of 4 sockets, but it is not necessary.*

**See also our article on the difference between Shield RMSc footprint and Holosun K-series footprint

Other footprint standards

There are many different bases for red dot sights, but the other most common are following:

How to mount red dot with Holosun K-series footprint

It depends on what device you want to mount it. Will you install it on a a picatinny mount? I.e. gun equipped with picatinny rail? Or will you mount it on a pistol? And will the pistol be optics ready (with pistol slide cut for red dot), or will it be standard pistol without such cut? You need to know answers to these questions before you start looking for a mount.

However, if we mentioned the red dot in the list above, you can be looking for a “mount for Holosun K-series”. The chances are it will be much easier for you to find such under that name.