During World War II, many USMC Marine Raiders complained of the M1 Carbine's performance against Japanese soldiers in the jungle, as the bullet could not reliably pass through thick vegetation without being affected. In response, the Marine Corps bought a large number of Remington Model 8s in the intermediate .25 Remington and fit them with large 20 round magazines. The resulting weapon was capable of reliably engaging targets regardless of vegetation, at medium range, and with rapid fire. Marine Raider veterans were instrumental in providing the United States with advisory regarding the M16 program, citing their experiences with the so-called M8 Carbine.