Very nice Hell Gap made of Smoky Hill silicified chalk (Smoky Hill jasper). Other names used for this lithic source are Niobrara, Republican River Jasper plus a couple of more names that are rarely used. Generally the stems on Hell Gap points are a bit longer and as others have mentioned the base looks like it may have been broken and then reworked.
Hell Gap points are one of the more elusive paleo point types to be found in the Great Plains region. I would be very happy to find one like that, especially one made of that material.