Marked MA for 'Made in Australia' or 'Munitions Australia' depending on your view, and is Lithgow produced

The Bren gun is instantly recognisable by its curved magazines, mounted on the top of the receiver. These magazines hold up to thirty rounds of .303 ammunition and it is the rim on this round that gives the magazine its distinctive shape. There are two distinct patterns of magazine for the Bren. The very rare Mk I magazine was quickly replaced by a revised Mk II design