I picked up my can this weekend. I went to the range today to give it a try. I was surprised with how much the point of impact changed. I defiantly need more range time to really get a bead on it. My question is will the POI change every time i put the can on? Will the rifle need to be zeroed every time the can comes on and off? My hope is that the POI change is consistent so the rifles can be left as is and i know that with the can on I'll be good to go. One thing I do know is that I'll be getting at least one more. The first rifle was my 24" barreled AR. The POI was over 4" to the right at 100yds. The second rifle was my 18" Alexander Arms AR in 17Hmr. The POI change was low 2". Thoughts?