Springfield has released a compact version of their Echelon. This pistol has a 4 inch barrel, and comes with both a flush-fit 15-round magazine and an extended 18-round mag. I know when I carry a compact pistol, I prefer to carry a larger spare magazine.
From the promotional image, it looks like this pistol is the perfect size to fit a TLR-7X light. We do have a holster for this combination here though it is cut for the slightly longer version.
Alternately, the Streamlight TLR-7 HL-X probably extends beyond the barrel, but is an excellent light.
Here is the promotional video:
