Breach Block Fitting?

[sherppa]

How close should the tolerance be between the breach block and the reciever? Is it common for there to be a noticeable gap between them, when the breach block is closed?

thank you,

sherppa

Information

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[musketshooter]

That gap you see is the gass escape cut in the receiver rail. It was enlarged several times over the production life of the firearm.