Check out Single Axis Robot - Linear Actuator 3D model on CGTrader for $24. High-quality mesh by TT112. Textured.
STL (Stereolithography, filesize: 30.1 MB), OBJ (OBJ, filesize: 18.1 MB), STP (STEP, filesize: 27.4 MB), X_T (Parasolid, filesize: 17.7 MB), IGE (IGES, filesize: 33.3 MB)