Royal Small Arms Factory Magazine

Bren Original 303 British 30 Round Magazines, Two Pack.

The original Bren gun was designated the Mark 1. It was capable of semi or fully automatic fire from a distinctive curved top-mounted 30-round magazine. It was 45.5 inches in overall length, and employed a quick-change 25-inch barrel which could be replaced in seconds, allowing it to keep up a sustained rate of fire. The Bren gun used a magazine rather than the better belt-fed system due to the theory (proved incorrect by the Germans with their MG 34 and MG 42s) that the former made the weapon more portable. The piece weighed 22 pounds and 3 ounces and fired 500 rounds per minute.

Throughout the Second World War, the Mark 1 Bren was modified three times to include the models Mark II, Mark III, and Mark IV. The same .303 caliber ammunition as the Mark 1 was used, so the differences between these patterns were a few pounds of weight and inches shaved off the later model’s overall length and barrels. In mid-1944, the Bren was standardized as the Mark III with a full length of 42.9 inches, barrel length 22.25 inches, and weighing 19 pounds and 5 ounces. Its effective range was 600 yards. It was essentially a lightened Mark 1 but fitted with a simpler ladder back sight of the Mark II, a shorter and lighter barrel (which reduced accuracy) and simpler butt. Over 57,600 Mark IIIs were produced during the war.