If you are happy with the rifle, don't worry about import markings. Import markings are just part of the gun's history and a means for some people to establish an artifical difference in value between their gun and your gun. As things become scarcer to find due to collector pressure, such markings will become a non issue.
There was a time in the 1950's when the collectors would not touch guns with post build markings like Well Fargo and Co.! In the 1960's the market was flooded with Britsh issue Colt and S&Ws and collectors didn't like the markings. Now collectors collect only those guns. As my mother used to say, "This to will pass."