Tamiya: 1/35 U.S. Self-Propelled 155MM Gun M40Manufactured toward the final stages of WWII, the M40 self propelled gun design employed a combination of proven M4 Sherman chassis components and the powerful 155mm "Long Tom" gun. It was a boon for the 8 man U. S. crews that deployed it, not least because of the serious mobility upgrade it offered over its towed artillery piece predecessors, and an impressive range of 23. 5 kilometers using explosive rounds; stability when firing was provided by a