How to ID MkII piston post??

[Peter Laidler]

You could just deepen the hole to suit. It wasn't a feasible option in the 40's but now, with better quality drill bits they'd drill down easily I'd say.

The reason for the change started when the gas port was opened up in the Mk1* barrels and Mk2 gas plugs. It gave more gas but that in itself caused a more violent unlocking/primary extraction. Hence the need for a more cushioned PP spring and plunger. This violent action was also the reason for the double return springs and later on, caused the buffer plate to crack in a circle around the face. That is the reason why we always polished the front face of the buffer plate, so that you could immediately see whether it had started to crack or break.

Information

Warning: This is a relatively older thread This discussion is older than 360 days. Some information contained in it may no longer be current.