But a respectful warning re BP's thread 7. Barrel nuts are diamond hard and adjusting the faces is a non starter unless you have a surface grinder in my opinion. They are made diamond hard just so they don't wear away at the rear surface. Doing that will also make the barrel nut loose in the opening. And the last thing you need are sloppy nuts!
As a matter of interest, learning about the mechanicals and theoreticals of the Bren during our apprenticeship took 3 months. That was after the we'd already learned the principles of heat and principles of small-arms. That is 3 months learning about the what's why's and wherefores of the Bren/L4's. And if you think that the interrelation of the No4 bolt, bolt heads and parts is difficult to get your head around sometimes, then the relationship between Bren barrels, CHS, locking shoulder, stops and barrel nuts is something else............Information
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