I recently returned two laser bore-sights for my .177 pistol. Both were not even close to being accurate at 25' sighting in. I have found that these two piece models (stem cone and laser body) when screwed together are not concentric to each other. This condition places the laser dot at different circular locations (about an 18" circle) each time the unit is place in the barrel. Unfortunately, the lasers could not be adjusted to compensate. I have read reviews on line where this same problem has happened to other laser bore-sight buyers as well. Has anyone experienced this same issue? Also, any recommendations on a bore-sight laser that does not have this issue?Thanks