[Calvin Locke]

I remember the FM2 as having only 4 X.50 guns. Given that, a second line defense (against bombers, the Wildcat being outclassed by IJN fighters) with less weight, and presumably longer patrol time would make sense.

[19th LA Inf]

I believe the FM-2 was equipped with a Wright engine, more powerful than the F4F’s Pratt & Whitney, hence the notably larger rudder for control of propeller-induced torque. Many FM-2s went on board small ASW carriers along with TBMs, the General Motors/Eastern Aircraft version of the TBF Avenger. Both were well suited to operate from the small flight decks.

[AppyPappy]

The FM-2 was an improved Wildcat that gave the Japs a fit, especially the kamikazes.