So true NZL1A1....... The initial production of Lithgow L1A1's were supplemented with a lot of Fazakerley L1A1 produced parts that went there with the machinery that Faz had started up production with. Alas, the industrial relations there ensured that they didn't start up early enough, produce enough or care enough! Until the government of the day said that they'd had enough! In Australiaicon we saw loads of readily/easily recognisable UF trigger mechanism housings renumbered for AD made L1A1's