Abstract: An augerless boring system uses a relatively slender drill steel pipe attached at a front end to a large tubular hammer. The hammer holds different drill bits. The drill steel and the hammer are located inside a casing and driven along with the casing by a power and advance unit. The hammer extends through a front stabilizer head attached to the front end of the casing. A stabilizer head improves drill bit control while supporting the boring assembly in the casing. The stabilizer head includes multiple stabilizer bars extending lengthwise along the inside of a stabilizer casing. A special thrust adapter is used for pushing the casing in a forward direction and attaches to a size adapter that provides forward pressure against substantially the entire rear end of the casing. The thrust adapter in combination with the size adapter provides even distributed pressure to the rear end of the casing for more effective thrust of the casing into a bore hole.