XD45 = 13 in the stack + 1 in the Pipe.

My Primary concealed carry weapon in a Comp-Tac Minotaur, and my favorite pistol to shoot.
Mine has a set of Williams Fire Sights on it.
Only catch, it will not feed Semi-Wadcutter style ammo. Ejection issues. Extracted case head hangs on the mouth of the next round. The slide does not have the "bump" on the bottom to push the top round down into the mag slightly giving room for the extracted round to clear it. Everything else feeds like green corn through a goose.
I don't know if this is the case with the 9 or not.
I recall you could send your pistol back to the custom shop and they would fix the slide so it would feed semi-wadcutters.
No experience with Glocks. Have handled a few, I Despise the Grip Angle.