MK27 MOD2 pistol here.
Nice pics. Funny how the gun community (at least in the Americas) unanimously hates SERPA holsters, but you still see them in use with some pretty high speed SOF units (RPIMA, GROM, SEALs, etc).
Never thought I’d see the day when SEALs would be sporting Glocks over the 226.
I think it may have something to do with Glock constantly evolving weapons off their proven, reliable and fairly economical basic model.
A friend, who ran with the SFs and continues to train and instruct tactical shooting, describes Glocks this way: The AR-15 of handguns.