Herlo replacement barrels

[jond41403]

Hello, was surfing the net looking at pictures of barrels and noticed the staking of the piston nut on this described as new old stock replacement barrel still in its package made by Herlo during the Vietnam war era. Was this common to do the staking on such a thin piece of the gas cylinder? Seems like it wouldn't be, since that area is prone to cracking. It just jumped out at me and I thought I would ask.thanks

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