ebairsoft is a shitty store with shitty service. they hold your money for a month without telling you why and then when you remember about your order and ask, they don't answer emails until you file a paypal dispute then your item magically comes back instock and is shipped.
that being said, that part looks to be plastic. If I were doing the conversion, I would want a metal plate back there with a metal buffer tube.
I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.