https://hatsanairgunsusa.com/wp-content/uploads/2018/12/Mod95-Exploded_View-June2013.pdflate edit:FYI ... Hatsan fasteners are just plain steel, NOT GRADED. You MUST use tools that fit the fasteners PERFECTLY or you WILL DAMAGE the fastener heads. I've seen this on EVERY ONE of the refurbs I've work on (dozens!). Everyone wants to blame the Hatsan steel, but it is really the IMPROPER SIZING of the tools used.I have a SEPARATE set of tools that I have custom ground to fit the various Hatsan fasteners PERFECTLY and I have not FUDGED one of the fastener heads yet :-)