I'm not sure if "feed tube" is the right term to use for 10 rd tube that feeds the pellets to the gas- powered 22 Crossman 400 repeater. This rifle was made from 1957 to 1964 by Crossman Arms Co., Inc. If any know a way to find old parts I have just about given up. Customer service at Crossman had no way of helping according to them. I can be reached here through pm. E- mail [email protected] or 6187805496 by phone or text.