Jmoore, thanks for the correction.

But that makes the situation even worse! There is no support from the receiver at this position.

Please permit me to correct my original sentence thus!
"At the gap, the strength of the whole action has been reduced to the thickness of the barrel remaining outside the sleeve."

This makes it even easier for the gas pressure to tend to lift the barrel metal off the insert - it will at least reduce the grip of the barrel on the sleeve. Which will facilitate the piston effect you rightly fear!

Definitely wallhanger material!

Patrick
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