Im looking for a good metal bodied m4 preferable with a rail , he has a budget of around £200 , ive been looking at classic army , dboy and cyma , but m4's are not my thing so ive no idea.
Would it be better to use a G&P basic m4 or upgrade my King arms plastic body m4 with a madbull receiver in order to fit a real rail? i ask because i want to get the delta ring thread pitch just right.