Today’s shooters are as likely to own an MSR platform rifle as they are to own a traditional bolt-action rifle. To date, the only option the semi-automatic user has for shooting bags is to use leather, thin polyester, suede or old shot Bags. The problem with these materials is that they are too thin, tear easily and are extremely susceptible to heat. Enter the ThermoBlock™ Shooting Bags by Allen with built-in heat-shield and 2x thicker ballistic woven fabric.