Anyone ever come across one of these before?

[GreyOps]

https://www.m4carbine.net/attachment.php?attachmentid=17654&stc=1&d=1375394042

G-19 with an external trigger-block style safety.

[ST911]

Glock makes a number of interesting variants for non-US markets. Some occasionally make it here in limited quantities.

Topical to your querstion: https://www.m4carbine.net/showthread.php?t=60116

[GreyOps]

Thanks for the link. I did get some more info, through a friend of mine who happened to be on the phone with Glock yesterday, that this was a special run of pistols for the Jordanians. Which makes sense as that was where I came across the pistol pictured.