I used this mount to put a holosun on my SP5K.  Shot maybe 200 rounds with it attached.  It clamps to the top of the firearm easily and gives you the ability to see the iron sights under the mount. I bought this from HKParts.com for $165, asking $100 firm.  Must meet in Mesa at Lindsey and Baseline.  I will not meet in the west valley.

Here is the website's description:

The HKP Raised Picatinny Optic Mount is designed for maximum versatility, providing a true universal mounting solution for red dot optics.  Our optic mount utilizes the same footprint as the VP9 Optic Ready slide.  That translates to being a direct fit for the Holosun VP9SCS reflex sight as well as any VP9 optic plate and its respective red dot sight.  Additionally, the included Picatinny rail opens this mounting system to a massive range of optic options.

Simple hardware and straightforward installation make swapping optics quick and easy.  The mount was specifically designed to maintain an unobstructed view of the factory HK sights as well.

Constructed from aircraft-grade aluminum and finished in durable cerakote, this mount stands out in quality and durability. Proudly made in the USA and available exclusively at HK Parts.