I am jealous. Love the FiveSeven. About the XDs, I shoot and carry mine with the factory mags and no extension and it works fine for me. If anything I would get a Pierce extension and not a full one as it conceals better without a larger grip.
2007 Z4 3.0si Coupe • 6 MT • Black Saphire Metallic • PP • SP • Heated M Seats • Clutch Stop • Stubby
2008 R6 • Raven Black • GPR Steering Stabilizer • Comp Werks FE • Hotbodies Flush Mount Blinkers
2008 Nissan Titan XE King Cab Long Bed • 4x4 • Line-X