Yes, the HS507K is the little one, made for the Shield RMSc footprint.
My P365 is my carry gun, and I had the slide machined to accommodate a red dot . . . and the red dot that I wanted from the get-go was the Holosun HS507K. I own a bunch of the HS507C sights (the bigger ones, made for the RMR footprint), and I wanted similar features in the mini sight for my P365.
One of the features that I like is Shake Awake, which means that the sight turns off when there is no movement for 10 minutes (or longer, if you set it that way), and automatically comes on when it senses movement. It should make an awesome battery life even awesomer, right?
I got my HS507K in October 2020. I set it to constant-on, and left it that way for four months and it ran fine. Then I set it to Shake Awake, and BAM, two days later it was dead. WTF. I replaced the battery, and it was dead again in two weeks. I did this with two more batteries, each dying in 1.5-3 weeks. Most of the batteries I used were Energizer (a good brand, right?), and one was a Chinese brand. Same result.
I emailed Holosun and explainted the situation. "Here's how to send it back to us, here's a shipping label." OK. I mailed it back on 4/12, and today (one week later) I received a replacement sight.
I just mounted it, and set it it Shake Awake using the battery that came with the sight. And now we wait.
By the way, I'm using brightness setting 7 out of 12; a couple of batteries with the original sight used setting 8.
I'm really happy with the features of the sight. I'm really happy with the RMA process with Holosun. Obviously I wasn't happy with the battery life of the original sight, so let's hope this new one is better.
On a related side note, I'm still unsure whether having a red dot sight on my carry gun is the right answer. I like dots on pistols in general, but carry guns have some particular challenges:
- The dot makes the gun a little bigger, and a little harder to carry and conceal.
- If you need to use the gun, you don't know how bright your surroundings will be, or how bright it will be around your target . . . so what brightness should you leave it set to? Having a sight with auto-brightness doesn't necessarily help, if for example you are in a dark area and your target is in a bright area.
- You need to make damned sure your battery doesn't die.
It seemed like a really good idea at first, but I'm starting to wonder if some good old-fashioned iron sights aren't the better alternative....