Throughly recommend watching some Explosive Enterprises.
https://youtube.com/@explosiveenterprises?si=aHgdMJkad3TSjO1C
The channel features plenty of VFCs, as well as running Vipertechs on VFC magazines, and they typically test things until they break, fix it then test till something else breaks.
The only TM stuff they currently have is the Saiga and Double Eagle clone, but still worth checking out.