Briggs Buick GMC IN Manhattan - SERVING As Your Junction City and Lawrence Buick and GMC Source. Russ Briggs started Briggs Auto Group over 35 years ago with one small used car center in his hometown of Manhattan, Kansas. Through hard work and 100% customer satisfaction, he has grown to 10 dealerships serving the Manhattan and Lawrence areas. Briggs Buick GMC is a respected Manhattan dealer and also serves Junction City Buick and GMC customers. We hold a huge inventory for Lawrence and Junction City Buick and GMC drivers.