After I had to close the ZF my 9.3 x 74 R in the heat of battle on the eye, it was after the shot the famous "Styrian Order on tape", ie a violet with laceration from which it ran. This paper will resist reliable. It is very easy to install because it is only plugged, but keeps doing very well. I have it mounted on a Meopta Meostar R1 3-12x56 RD. Everything is perfectly to use, even the diopter would still leave the function as required. Now "warns" the rubber when preparing the weapon, the bang I really feel not that the bellows is still somewhat compressed together on the eye as it is very soft. Only if the weapon is not quite just sat at the shot before the eye, it's hard to see through the fire as the bellows "closes down" then the bang shortly. But better so than if the eye is made dense by the IF ...