There is also the Steve Nelson article from the Summer 2008 ACGG, he cut the bolt between the guide rib and the rear lug too.

If you use the "cut under the extractor collar" approach you run into issues with the gas release ports and the firing pin block, all very solvable but illustrates that there are many approaches each with its issues.

Its discussion on the "the issues" I was hoping to generate and learn from.

Cheers