Replacement screw sets include two special manufacture, hardened trigger pin screws and four front screws used on all SJC dot sight mounts. One set is included with each mount purchase.Front screws install using a 2.5mm allen wrench. Frame bushing are SJC special manufacrure stainless steel flanged bushings used to attach all SJC mounts and or SJC thumb rest frame weight kit.
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Very fast & beautiful quality just like the originals