It would seem as if the title of this topic may actually not be correct...
Indeed, according to Jos Heyman, the first XF2M-1 was actually completed but never flown. If true (and I don't know where Heyman got that bit of information from) I would be quite curious to know whatever happened to it:
General Motors developed the XF2M-1 single seat fighter based on the FM and three aircraft were ordered in October 1942 with serials 82855/82857. They were, however, cancelled before the first aircraft, which was completed, was flown.
Specifications:
span: 37’6”, 11.43 m
length: 28'6", 8.69 m
engines: 1 Wright XR-1820-70W
max. speed: 320 mph, 515 km/h
Source: https://usmilitaryaircraft.files.wordpress.com/2015/04/navy-m.pdf
Data obtained from a 1/5 scale model of the XF2M-1 is also included in NACA Research Memorandum No. L6116 (May 16. 1947):
www.dtic.mil/dtic/tr/fulltext/u2/a801419.pdf
I'm attaching a profile view from Heyman's archives, as well as a coarse three-view based on a 1/5 scale model tested by NACA.