As of my last update in January 2022, there hasn’t been any information available about a Kel-Tec R50 model. It’s possible that this is a new product introduced after that time. If it’s a rifle, given the “R” designation, it might be similar to the Kel-Tec RDB, which is a rifle platform. However, without specific details, it’s challenging to provide accurate information. If you have any other questions or need information on existing Kel-Tec products, feel free to ask!  Kel-Tec R50 5.7x28mm