You should really get on "YouTube" and checkout a guy named "Mark Novak" look under MP-18 Restoration he takes a thoroughly welded up Mp18 Dewatt and brings it back to life he is an excellent gunsmith . Even the most fried Dewatt can be saved given the right guy to do the job.By the way I have owned a beautiful MP-18 for the last thirty years they are incredible , wonderful guns good luck I hope you find a nice one ,but don't hesitate purchasing a dewatt for the right price.