I also observed some amplified muzzle rise and recoil when utilizing defensive rounds for example Sig V-Crown masses, but it surely wasn’t unmanageable. At it’s release HP was however beneath the gun from law match and political pressures of time and preferred their revised carbine to fly under the radar. https://9mmhandgun84848.dbblog.net/12874902/9mm-carbine-no-further-a-mystery