Quote Originally Posted by Peter Laidlericon View Post
That was always a good Armourers trade test question or one that the instructor, the most dis-likeable Harry Weeks would ask some unfortunate apprentice to come out to the front of the class and explain, as if teaching a class himself. Once he'd tied himself up a bit with his lack of technical expertise or inexperience or just inability to speak out loud to the class, Harry, we called him SIR, spelled CUR, would berate him on front of everyone. Another good one was the extractor trackway of the .300" M1919 Browning. I always had a dream that IF I was ever Commissioned (and I was much later) it'd give me much pleasure to walk into his class and while he was surrounded by his apprentices I could say ,..... stand up when I come in Mr Weeks' . Yes....., where was I?

The depth of the guide hole for the longer plunger, spring, piston post. If you use a longer plunger in a short holed piston post, it will bottom out every time the post unlocks the breech block (it is in fact an unlocking buffer), burr over and jamb up to buggery inside the hole in the piston post

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Sorry Peter, would you (or anyone) have the correct depth for the Mk2 piston post guide hole? I have five piston posts, a couple sold to me as Mk1 but they all have the same depth from the spring and plunger opening to the bottom of the guide hole recess, it's about 81.5mm. I'm guessing they are all Mk2 but want to be sure I'm installing the right plungers.

Regards

DOD