The LE6920MP-FDE is a standard LE6920 fitted with Flat Dark Earth Mag-Pul accessories.
This included the Mag-Pul stock, pistol grip, curved trigger guard, hand guards, pop-up BUIS windage adjustable-only rear sight, and vertical forward hand grip.
Is a LE6920 with the US Army standard Matech steel pop-up windage and elevation adjustable BUIS rear sight, the standard military type M4 stock, and a heavy railed hand guard with Mag-Pul rail covers to cover the rails you don't use.
Both rifles come with one Mag-Pul 30 round magazine. The FDE will have an FDE colored mag, the SOCOM wil be black.
Either will not come with a cleaning kit or sling, and only the one magazine.