This is older production, "new old stock" This is not used, just something made 5 to 13 years back. This item will not have a CAGE Code. Generally, these will have the KAC emblem and marked Knights Armament, and may or may not also have Titusville, FL. These are not Vero Beach vertical grips.
The VFG has been historically used by the US Military on combat rifles which had a Picatinny RAS rail during the GWOT, such as the Mk18 and M4A1 with the RAS and an A-frame front sight base. The KAC vertical grip without CAGE code are new old stock.
Knights Part Number: KM-97098
Charlie's also features the same vertical grip made by different military contractors, like the mil-spec vertical grip from P&S Products and Prudent North American Technologies