This is an example of a "US Air Force" M4 bolt action survival rifle. These rifles were developed after World War II and were intended as a survival rifle for downed fighter pilots and bomber crews. They were not really intended as a defensive weapon but more for hunting and survival. They saw service well into the late 1950s and early 1960s with B-52 bomber crews. Manufactured by H&R at the Worcester, Mass plant, the rifle has a blade front sight and Lyman 55-H adjustable rear peep sight, matching numbers on the barrel and receiver, two-line Worcester address on the left side of the barrel/receiver, "RIFLE. SURVIVAL. CAL .22. M4 (HORNET CARTRIDGE)/U.S. PROPERTY" on the left side of the frame, and telescoping wire buttstock.