I feel I'm very fortunate that the mentor I had in 1969 was very knowledgeable about 1911 guns. He taught me that 80% of the mechanical accuracy in a 1911 pistol is the barrel and the way it's fit. It was the first time I heard the term hard fit when talking about barrel fitting. If you want the kind of accuracy like the target above shows you will need a hard fit barrel and you can't achieve this with a drop in barrel or just by linking a barrel up with a longer link. At one time we did use Colt barrels welded up and fit them hard fit which is the same thing one would do today by hard fitting a gunsmith fit barrel.