This is the mp5 top rail you are looking for! - Midwest Industries Mi Hk Mp5 Top Rail M-lok Black

I took a gamble choosing this Midwest Industries top rail for my new HK MP5 22LR build. At the time of purchase, I personally was not able to find any evidence online that it would fit the 22LR model explicity, but the standard/non-mlok version (MI-MP5-OR) was a confirmed fit, and I figured that Midwest Industries wouldn't deviate from the base design. I know it's overkill for a 22LR, but there's so many cheap MP5 optic mounts on the market with such mixed reviews that I just wanted this to be the last thing to worry about on my rifle. Also, I'm not even sure if I would make use of the mlok slots, but who doesn't like the option?

As other reviewers have mentioned, installation can be tricky. There's an instruction video on Midwest Industries website, but the first time, I still had trouble lining up all the mounting screws with the feet perfectly. Also worth noting: the package comes with a set of longer mounting screws which I definitely needed to use to reach the feet given the dimensions of the reciever. After maybe 15 minutes of trying, I finally got the last screw to take, and I was incredibly satisfied to have this solid platform working! So, if you're reading this, this might be the only confirmation you can find that it fits the 22LR model. Cheers!