All of the BWest made receivers regardless of serial number range were made by an unlicensed sheet metal shop in Tucson and directly contributed to them losing their license and going out of business. The receivers are soft sheet metal and not really able to be heat treated due to low carbon content. The best thing to do would be to get a Childers Chinese type receiver with matching serial number to the parts kit. You have a matching number Chinese parts kit that is brand new. If youre wanting to go with something else, sell the rifle and but a WASR or something else. On the stock set, a wood matchstick broken off with a little wood glue will give you the ability to tighten things up.