The fastening system is rubbish, it doesn't stay locked in any way. I ordered it and it came to me scratched and the fasteners were tattered. I sent it back for replacement, being careful not to overtighten when installing. But it was impossible to tighten it so that it would stay on target and not move after each shot without removing the screws. The threads are not properly tapped and the fastener is plastic with poorly designed turnbuckles. I love the idea and even the range finder part worked well but the mounting system sucks! If Bresser made a solid mounting system or an aftermarket system was available I would try again.
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