7.62mm Semi Bren. Failure to chamber

[WallyG.]

If you can get a Zb 39 magazine and see if it feeds... the fact that the feed lip was adjusted is the change that took place between function and malfunction. Not sure what modifications (if any) were made by Historic Arms to allow for use of the L4 mag in a .303 gun body... may not conform to the official conversion mods done by the UK military. The South African barrels usually function well with a .303 bolt and Zb mag... your variables should lie with the mag.