That is not a Model 1917 , which had a distinctive "dogleg" bolt handle and most definitely was not a Mauser derivative.
Also, the 1917 was not called the "American Enfield", it is referred to by the name of the arsenal that made them, Eddystone, they were also chambered in 06 for American service since we had boat loads of the stuff, those made for the Brits however were chambered in .303 which they had in abundance.
Some .303 Enfields were diverted to the US for use in "homeland security" Factory guards, Coast guard beach patrols etc. type mission were ammo would not be much of an issue
"