I am in the market for a new slide action shotgun. I have a couple of 870's and like them. Problem is, I understand that new 870's have an integral locking system. If true, Remington has lost me as a customer. I had an Ithaca long ago as a kid. I remember it fondly. Question is, Is an Ithaca 37 as well built or better than a Remington 870? I've heard that the receiver walls on the Ithaca are the strongest (thickest) in the industry, true? I am looking at Ithaca's "New Custom Classic". How does this compare over all to the 870? Thanks, Sam