this guy, mercy
The longer link can solve a lockup problem. Say you only have .020 lockup. If you plan to shoot this gun for thousands of rounds, this simply isn't enough. The cure can be as simply as adding a longer link which pushes the barrel further up into engagement when the gun cycles. What it did do was force the barrel lugs to be ground down by the lugs in the reciever unti they now fit again. The only problem with this is that he probably only has around .015" engagement left on the barrel. The cure is to swap the barrel or to weld up the lugs and then refit them to the reciever with the correct link which a good smith can handle, but this one sent him back to Colt for the work. I hope he didn't ruin the lugs in his reciver as well, which sounds like he might have messed them up with this stunt.
He said he only had 53 rounds through it to begin with. Now he has changed the story to the smith changed the link trying to fix the lug problem. His original post about this said that he took the gun to a smith to check some of his minor work. Boy have I heard this one before, "My brother in law took this one apart and I can't get it back together." I warned him about the bill he is going to get. He says he is about to start a his bid to have them fix it. <<<LOL>>>
Folks please don't take this the wrong way, but 53 rounds isn't enough to know if the gun functions correctly. Break the gun in with at least a couple of hundred rounds before deciding something needs to be changed. Then go slowly in to that dark night........ Unless you have a good knowledge of the weapon, never change something out especially something like a link which changes the lockup of the gun. This guy took a brand new gun and ground it down to a wore out gun in a hurry. I don't know why it happens, but things like this happen a lot.