Long Fei's video details his modification of a VFC T91 SOC GBB, building upon his previous T91 projects (Guo Hun T1, MWST1, WT1). He showcases the VFC model's realistic design and performance before demonstrating the disassembly and modification process, which involves installing a Dial Defense handguard, grip, and stock, along with a magazine well, larger magazine release, and a 13.7-inch handguard.