Is it normal for for a 3 lug adapter to have a little wobble? I'm not used to cans having play when attached and my lizard brain tells me this is a bad thing. I searched around and this seems to be a common issue with this mounting system. Those of you with experience with 3 lug mounts - do you see this as a problem? I've used this adapter on 2 different rifles (Zenith and POF) and it exhibits the same wobble on both.