This Winchester M70 was a rifle owned by the Captain of the Camp Pendleton rifle team, and as such it is an excellent authentic example of the US sniper rifle of the early Vietnam era. It is chambered for the .30-06 cartridge, with a Winchester heavy target barrel and shorter stock. The scope is a 14x Unertl - quite high magnification, considering that the most recent official issue sniper rifle at the time was the M1D with a 2.2x scope. These rifles were used in a quasi-official capacity in Vietnam, and would ultimately evolving into the official M40 and M40A1 sniper rifles.
US WWI Snipers: https://www.full30.com/video/65a7a1b20b01b0776658c42108d794b9
M1C Sniper Garand: https://www.full30.com/video/858903296804cf447c9badfddd16827c
M1D Sniper Garand: https://www.full30.com/video/76fe1adfc8f1273420065c1a14c43fcf
MC-1952 Sniper Garand: https://www.full30.com/video/b6111dfde163c1e79d9552fe1120b16d
M1903A4 Sniper Rifles: https://www.full30.com/video/f7b62b7c1e1c7d8b57bd64e6f78b59c5