True, but the most obvious points to place a strike/stamp would be the tip of the firing pin and the chamber wall where the casing expands upon firing.
Bolt face I don't see hitting hard enough or creating a clean impression if it did, (not to mention the presence of markings there on the cartridge base already which would interfere with the stamping clarity), extractor pawl 'mabe' but to get the stamp into the slot of the extractor in a position where it wouldn't get distorted inside that little slot would be pretty difficult leaving the ejector as about the only other option, provided it was the 'spike' type rather than a spring loaded pin type.
Another annoyance is the part about a microstamp install shop doing them in lots of 1000.
I can already see delays, delays, delays as people wait for thier item to get from manufacturer to the stamp shop, then delay until they get a big enough inventory to make a run, then ship it all out to all sorts of different locations over the state.
I mean that couldn't add on more than a month or five to the time between initial order and payment until delivery.
Nothing likemaking a purchase as freaking tedious as they possibly can to keep the pesants from obtaining that which is thier right.
*severe sarcasm mode*
Hey, y'know, if they just serilized ammunition to begin with then made people show a permit or FOID card to purchase it, then log the weapon information at the time of ammunition sales they could forgo the whole microstamping thing all together.