Hi All, Just checking to see if I understand this conversion. (Ok. Eye-rolls. I don't know much about the Bren) 1.) Find a South African Bren 308 barrel 2.) Verify the headspace in 308 is reasonable in your gun with your 303 bolt 3.) Install 308 extractor into 303 bolt 4.) Find ZB39 magazine (right next to hen's teeth in isle 3 behind the South African Bren barrel). Don't load too many rounds. About 20 rounds. I assume dial down the gas system to low. Is this really ok? I'd hate to hurt an old Bren. I have much more 308 lying about than 303 these days. Thanks to all that can help. Enjoy, Grasshopper