Good stuff, but perhaps a little lacking in some areas - like, the 'M' on the new mag catch was not to ID it as 'for the magazine' - it was to ID it as the 'modified' catch so armorers could quickly tell the difference. And, a partial purpose of the revised slide with angled extension was to allow more dwell time before opening the bolt. I was very glad to see the note about the use of raw linseed oilicon.