Sorry up front, I may not have the nomenclature down on this.. It's really been one of the last areas I don't fully understand about the 1911 and there is a particular question that has been driving me mildly nuts. There was a thread recently about the VIS cut which was really wonderful about explaining the nuances of what goes on with the link, barrel lugs/feet, and the receiving cuts on the receiver. First off, what does VIS stand for? (vertical interface surface?) Secondly, and my main question.. as the barrel moves upward and forward toward lockup/battery, the link pivots until the lug feet mate with the slide stop and the link holes are vertical. Is the link itself the spacer that determines how tight the upper lugs mate with the slide cuts? I have seen Wilson link sets marked 1 - 5 and it seems logical that this is the story. But you know what they say about assuming What say you experts? As a follow up, I have pressed downward on all of my Colt's barrel hoods with the pistols in battery. My GI pistols and a well used 70 Series from 73 have a slight dip when pressed. (It is slight, I have felt other off brand or parts guns with a more significant dip) All of my other late model Colts have a rock solid barrel lockup when pressed. As I understand it, tight lockup is essential in bringing out the best accuracy. How bad is it at the other end of the spectrum with a sloppy barrel fit? Do you just lose accuracy or can you prematurely wear out or cause other damage? Is it worth while to buy new links for the GI pistols or is the slight dip just ok milspec looseness? Thanks for reading and big thanks for knowledgeable responses! Finally I raise my drink to Army Chief- Thank's for the good reads, I'm extra sorry to see that you were so young.