The Glock "Marksman Barrel" or GMB, which "utilizes new barrel rifling to deliver improved accuracy
Removal of finger grooves on grip
Addition of an ambidextrous slide stop
"The nDLC finish is a tougher and more durable finish that is exclusive to the GLOCK manufacturing process."
"Introduction of a flared mag-well increases performance by making it easier to funnel the magazine into the mag-well, particularly in high-stress situations."