Actually there is.the modified guide rod.
I don't see how that would affect assembly. I have both styles on my guns and there is no tension on the slide unless the recoil spring is under tension. If the STI does not allow for disassembly with the recoil spring free, I do not understand the problem getting the gun back together.
I just came back from the range after shooting a Ruger SR1911 and a Smith and Wesson 1911 Pro. One has the full length guide rod and one is the little short one.
Perhaps someone can school me on the STI about a facet of field stripping that is not familiar to me.
I have heard of folks who have taken the slide off a 1911 with the plug still installed and the slide under tension. That seems to be a WHOLE lot of looking for trouble.
What am I missing?