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Mk13 Geissele Trigger

WTF is so special about this trigger?
Never officially sold to the public, but a handful were purchased from Geissele. The $5k GunBroker listing above is from a few years ago when there weren't any of these triggers in private hands. Now you can grab them from collectors who have them for about $2,000 or a little less. There's probably 2 or 3 dozen of the real Mk13 Geissele triggers currently in private collections, so they're still pretty rare.

Match grade barrel fouling after 40rds?

That’s the problem with bore scopes. Everyone sees barrels as living in a binary state. The are shiny and perfectly machined, or the are rotted/pitted/cracked which means bad. There are states in between that still allow the barrel to still shoot reasonably accurately. What they don’t show are out of bounds chambers/throats and ammo deficiencies.