Please advise your buddy that all of G&G's blowback models are plastica versions. As a retailer who's sold a few of those models I have to mention that there is a reason why we do not sell them anymore. The blowback is not very reliable and from previous experience there have been problems involving the safety switch, the blowback over functioning and shotting involuntarily, and other minor problems.
Overall, if the problems do not occur it is an excellent gun but I've had quite a few of them returned for repairs.
To avoid problems try going for the non blowback variant ... especially since that model is full metal (except the upper receiver).