C is compact with 4" barrel and 15 round mags for standard. Offered with and with out optics ready.
F is a Full size with a 4.5" barrel and 19 round mags standard. Offered with and with out optics ready.
We also make the F comp ready that is a 5" version, has 3 mags instead of 2, HBI trigger shoe, APEX slide release, mag release. Barrel in TIN coated and backplate is aluminum instead of plastic. Also has Henning Aluminum base pads. Only offered Optic ready.