Originally Posted by Smakmauz

Valid point. I don't have a conversion for any of my M&P's yet so I can't say if it would cause any issues.

The only thing I think of when I go through the extraction process in my head is that the spent casing would be held straight by the chamber until it is almost clear and by that time i would think there would be sufficient momentum for a pretty clean extraction. Especially since the case would have expanded to the chamber diameter taking out any chamber slop that would have been present prior to firing.

I wish I had access to high speed camera.... It would actually be really interesting to see the extraction process of a gun with a conversion barrel from the top in super slow motion. Just because I'm a nerd like that.