Just like Gravedigger said, some had problems some didn't, it seemed very hit or miss. I for one put probably 1000 rounds through my Onza with the TRG/SOS system and the only issue I ever had was that the rubber piece wore out, and started slipping off causing errant shots. But it was replaceable with new rubber pieces. I ended up doing the change to the traditional slide/rod in an effort to quiet the rig down, which was successful. Hope that helps!