What caliber do y'all think this is? The only distinguishing marks I was able to find was a 703 on the band closest to the rear iron sight I know chances are this is just a parts number but I feel it's worth mentioning and the bolt is 11/16ths of an inch. The bolt is visible in the third photo I do not know the diameter of the chamber just the bolt. There are no distinguishing marks aside from the 703 on the entirety of the rifle.