from the SW site, 10199 shares the same dims as the FDE model; longer i'm sure due to the adapter. perhaps a printed catalog has a typo?
M&P(R)22 COMPACT Threaded Barrel | Smith & Wesson
SPECIFICATIONS
SKU: 10199
Model: M&P®22 COMPACT Threaded Barrel
Caliber: .22 LR
Capacity: 10+1
Safety: Manual Thumb Safety
Barrel Length: 3.5" / 8.9 cm
Overall Length: 7.3"
SKU: 10242
Model: M&P®22 COMPACT CERAKOTE® Flat Dark Earth Threaded Barrel
Caliber: .22 LR
Capacity: 10+1
Safety: Manual Thumb Safety
Barrel Length: 3.5" / 8.9 cm
Overall Length: 7.3"