The standard service rifle of the US Army Rangers is the M4A1 with the SOPMOD kit. Some units have used the FN SCAR-L in the past, but the order for SCAR-Ls to equip the whole of SOCOM was cancelled in 2010.
No
The FN SCAR is a special operations combat assault weapon manufactured by the Belgium firearms manufacturer FN Herstal. It is a modular combat rifle chambered in either 5.56 NATO or 7.62 NATO calibers.
Just the fact the the FN-F2000's ejection system was specially designed to be ambidextrous without any special mods is a big +1 in my book. Both (standard, non-variant) weapons fire 5.56mm ammo, the norm for assault rifles, but only the FN-SCAR can fire larger 7.62mm NATO rounds. Then again, the FN-SCAR uses small 20-round magazines, while F2000 rifles provide 10 more rounds. I give my edge to the F2000.
Either one is fine.
The FN SCAR is now available but you will be hard pressed to find one available even at the $2,300 retail price. I think the official date was 12/15/2008.
No such nomenclature. You're probably thinking of the Mk 13 Mod 0, which is a 40mm grenade launcher designed by Fabrique Nationale for use with the FN SCAR. The launcher itself is marketed as the GL1, and was designed for use with the FN-2000. Mk 13 Mod 0 is a USSOCOM nomenclature for a variant of the GL1, designed for use with the FN SCAR.
With the Picatinny rail mounted variant, yes. But the M320 would more likely be used on the SCAR series rifles.
As far as what's on the official inventory, it would be the FN-SCAR, which currently is only used by special ops units. As far as a general issue rifle goes, it would be the M16A4.
Colt and FN
Contact Browning Firearms Customer Service. Many of the FN records were lost during the war.
Browning.com has a sn function under customer service.