I own 2 PTRs (9CT & 9KT), the HKs SP5 & SP5K, and the B&T APC9 Pro which is hydraulic buffer assist blowback. The felt recoil of the B&T felt about the same as the other two platforms, at least to me. I also own two 9mm Stribogs, and several Sig MPXs (among others that I’ve post on here beforeok, i though (more like told) theb&t was roller delayed, but it isn't..............looks like maybe a ptr instead