PMM B&T APC9/APC9K Factory Stock QD Mount

Pretty sweet. Run mine on the lower rear eyelet an H&K UMP stock and it fits great. The anti-rotation feature makes sense in this application; and it’s cool, if you think about it, you can fine tune your perfect swivel angle before you run in the cup support screw. Arrived promptly and thoughtfully packaged. For the install, I did opt for Vibra-Tite VC-3 instead of the supplied blue threadlocker.