Remington won the M4 bid a year ago but didn't account for the proper royalties to Colt. Colt challenged and killed the contract. FN won this contract and probably will keep it since they have tons of experience with the M16 contract. Many never felt that Remington was up to this, to build a real M4 they'd have to do a whole lot better than a rebadged Bushamster.
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together.
US Army 1966-69, VFW Life Member, Retired Geek