Abstract
In order to design/redesign an optical sighting device used on an automatic weapon, several issues related to the behaviour under loads that appear during shooting should be taken into account .Also, in order not to influence the effectiveness of the weapon, the mass and the volume of the device must be as small as possible. In this paper, a comparative analysis of the behavior of the the ensemble sighting device - clamping system, subject to inertia forces is undertaken in the following two cases: the ensemble parts are made of duralumin and, in the second case, of polyester resin. The study is performed by means of numerical calculus, on the model being applied an acceleration in steady state mode. Keywords: sighting, optical, finite element, plastic material