Sometimes DOS' stuff is uploaded in a zip to the uploaders, but he doesn't post them himself. Either he puts it on Futaba or some chinese imageboard.
Is the artist even DOS? It looks like Tennkoma to me. Either way, I don't think it's related to Tennkoma's Hit comic. That's part of his unavailable doujin and is less violent than this.
This IS DOS's early work, i assure. Actually He once said his artwork is heavily influenced by Tennkoma's. Shameful he joined the military recently thus don't have much time to take it easy. If he has anything new, I'll post them here.