Looks like my 26, I added (Marine Spring cups, because I kayak) Extended Lone Wolf (Blind Marked) barrel (just cause it looks cool),
Pearce PG-39 grip extensions (+2 in .40/+3 in 9mm) gives the best little finger grip of all the extensions I've tried, which are numerous,
an internal Guide Rod laser and Advantage Tactical Sights (I put those sights on all my Glocks ... love them).
I don't think the OD (Olive Drab) shows through some of my shirts as bad as black guns do. (I know, it's all in my head, no one ever noticed my black or Stainless ones, but I "feel" better now.)
My 19 pretty much gets to rest at home since I got the "Baby"
It's my EDC (Every Day Carry) for over a year.
LOVE IT, hope you enjoy your 27 like I do my 26 ...... I know you will.