Cannot think of a better designed claw mount - UTG Pro Extended Picatinny Claw Mount for MP5 / MP5K

Works perfectly with the original SIG MSR. I have a completely clear field of view with the red dot, and if I am in a bad situation (hopefully that never happens) the iron sights are also usable and unobstructed at all times. With this setup on my AP5SD, I have two different sighting methods at all times independent of each other. The mount is light yet sturdily built, and installation is much easier than other claw mounts I have tried. The price is right. I would recommend this over any other method of mounting a red dot to an MP5 variant.