My buddy has an M1A for sale and the serial dates 0588XX to 5\1990 with 7.62-mm M1A on the receiver heel. The Bolt is marked 7790185 66118 X and the trigger group is SA & the Barrel is marked HR and no markings on the OP rod. this gun is still new in the original box and he wants $1300. I am thinking about buying it. Is it common that the Rifle came this way from the factory or the parts have been swapped out. I live in NY and this being preban is a plus. The rifle did come with a bayo lug on the FH.