I have 2 new old stock gas cylinders one is a Mk II the other is a Mk III . Are they good to go or do they reaming , the Mk II has a raised lip or edge at the being of the bore that prevents the gas piston from entering . If you push in the gas piston from the muzzle end it will go all the way to the very end and stop at the last 1/64 '' . Do you have to chamfer the edge of the gas cylinder ? The Mk III the gas piston will go in from each end but can not go pass the vent holes , are there burs from the machining of the vent holes that need to be removed ? I hope this the right Bren Gun section to post in
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