Do you really think the M&P compact is bigger?
Largest to smallest regarding these models, directly pasted from Glock and SW Web sites I knew all of this from looking at this info before comparing the G19 to the M&P and the G26 to the M&PC, but when I went to paste this, I was surprised at the G17 being so close to the M&P and slightly smaller, but I know the others definitely feel the way they're measured:
S&W M&P 9 MM
Overall Length: 7.5"
Overall Height: 5.5"
Width: 1.2"
Glock 17 (9 MM)
LENGTH - 186 mm / 7.32 in.
HEIGHT - 138 mm / 5.43 in.
WIDTH - 30 mm / 1.18 in.
Glock 19 (9 MM)
LENGTH - 174 mm / 6.85 in.
HEIGHT - 127 mm / 5.00 in.
WIDTH - 30 mm / 1.18 in.
S&W M&P Compact 9 MM
Overall Length: 6.7"
Overall Height: 4.3"
Width: 1.2"
Glock 26 (9MM)
LENGTH - 160 mm / 6.29 in.
HEIGHT - 106 mm / 4.17 in.
WIDTH - 30 mm / 1.18 in.
See the comparison chart of glocks at
http://www.glock.com/english/index_pistols.htm then click 'Models' to see the grid of sizes, and see comparable 'compact' models to the 19, and comparable models to the 'sub-compact' 26
FWIW, I think the M&P series' contours makes it feel a little smaller than it is, though. But lining them up side by side, seems to reflect the measurements above...
Hope that helps.
Karz