Object has got too much vertiges

[vanfreddy]

hi
click on the biggest object go into edit mode > facemode if u press c u get a marker tool mark some faces and press strg+L
it auto mark the other conneted vertices continue this step until u got marked any complete part e.g. front grip (its very important to mark it on this way, otherwise the model can be destroyed with non -manifolds and so on) .Now press P and choose Selection. Ur done, model is seperated and materials are all ok nothing to do.