Hi Gents,

What exactly is the difference between a Mk1 and Mk2 Piston post? If I understand correctly the Mk2 post was an upgrade to all Bren's but what was the change. I can see that the Mk2 plunger is longer but is there a physical difference in the post? The spring is the same, is it not? Again I understand the extension to be the same as well and we can all see the difference in a Mk2 gas piston but what's the story with the piston post?
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