A while back I purchesed a Remington 870 Police Magnum with a 20" barrel at a going out of business sale. I would like to have a little custom work done on it, like shorten the barrel to 18" (what does the law say about barrel length)? & re-install the bead sight, back bore and a trigger job. I want to keep the wood stock (looks like the ones I saw in Nam). Who does good work at at a fair price? I've looked into Wilson, Vang, and Robar. Who am I missing? Any smiths on this board do good shotgun work? Thanks, Sam