I think I've found and alternative and mount to B-Square for HK sporting rifles. This should proivde a solid mount for HK sporting rifles. It comes with an 11mm rail, which is common in Europe. Leupold, Burris, Millet, BKL and B-Square, along with EAW all make scope rings for the 11mm rail. The mount has mounting studs that fit into the 05 clamp sockets in the top of HK receivers. Another option is take the 11mm base and have a gunsmith use it as a pattern for drilling a weaver or picatinny rail, or if you must have a removable mount one of our quick detachable bases for use directly with the studs. I've ordered a set from Germany and will let you know how they work.