It's a Nagant. You can tell by the ammo box shape and indentions on the stock and the cocking handle. To the idiot who thinks it's Springfield…Springfield stole the 1903A3 design from mauser and altered the cocking mechanism slightly to avoid patent infringment.
the United States Ordnance Department determined that the US military needed to replace the antiquated Krag-Jørgensen rifles with a modern Mauser type. Their solution: simply “borrow” the Mauser design and chamber it in 30-06. They say imitation is the purest form of flattery, but Mauser Werke was anything but flattered by the US Ordnance Dept’s imitation Mauser. They filed suit in the early 20th century and the US government was forced to pay royalties to Mauser Werke.
https://www.thetruthaboutguns.com/gun-review-m1903a3-rifle/