I read several reviews on this mount saying it wouldn't fit. The only other one I found cost about $100. This one does fit my H&K MP5 .22LR. The data on this states it doesn't fit. I decided to try it for, $12 what the hell. When I first tried to put it on It didn't seem that it would fit. I could get the claws on the right side, but couldn't get it far enough over to put the clamps on, they seemed to be at an angle and wouldn't sit straight. I found if you hold the brackets away from the mount and then start the screw it does fit. It is tight, really tight, but it is holding up and does the job. So there you go it does fit the H&K MP5 .22LR made by Walther.
This review was written in the old system and had content requirements that are different than reviews written today.