Important Remington 1903A3, 7.62 x 51mm. Etched on the huge/heavy 21" Walker barrel "Rifle Accuracy-7.62mm-D7553790---#6" and "7.62mm-7553795-Walker-No II". Only 15 are known to have been built for the testing of this caliber-this one #6. This has been tapped for a scope, and the large barrel ring has been modified to accept a scope as well. Overall a very rare piece of US Militaria. This has an etched, matching number on the bolt, about 90% blue and an excellent bore.