[Question for gunsmith on barrel hood lenght]

I took Bob Marvel’s class on building a 1911’s, we used .001” feeler gauge between the barrel hood and breach face. That should be a tight fit. so the short answer is it should be less than .001” between the barrel hood and breach face. If you really want to understand building a 1911 you can’t do better than Bob’s class. 

[Gunsmith for 2011 Carry Build]

What work is needed, the build shouldn’t be much different than a single stack 1911?