The Bren doesn't run on a lot of oil Son. It's really the piston extension slides in the body, the locking cam surfaces and importantly, an oil coating on the inside top surface of the body where the top rear surface of the breech block frictions.
You COULD tell him to get his head out of the sand regarding the perceived notion that it's a tried and tested system............ It's clearly not that well tried and tested because it ain't working. If the breech block and piston aren't going fully to the rear and touching the buffer plate, then there isn't enough gas. It's really as simple as that. He could try to eliminate some of the not so obvious areas, like fitting a new gas cylinder and piston but as I said, it'll be insufficient gas.
Next time you're here in the land of the Poms Son, we'll get you in the Armourers shop for a day with a few Brens and L4'sInformation
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