This model is without the mechanism, only appearance. Hight detail. Fastening place - for a Picatinny rail. Did on photos, and though very much tried, there can be any insignificant discrepancies. Information has found a little, some details should be thought out. Originally modelled in Rhino 4, in other file formats mesh is not optimized! Final images rendered - Fryrender. Materials are from Fryrender.