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Old November 16, 2012, 12:21 PM   #10
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Join Date: March 15, 2005
Location: Central Connecticut
Posts: 2,973
Maybe your Lyman doesn't need them, but there's O-rings that fit inside of the primer pockets of CVA and TC breech plugs which serves to shim the primer and to seal the primer pocket from blow back by creating a very slight crush fit on the primer when the receiver is closed. One just needs to be careful that the primer is not too tight and will not go off when the action is closed.
The O-rings are 4.5 X 1 mm wide #9262K611:

It's mentioned in these threads:

Last edited by arcticap; November 17, 2012 at 04:26 AM.
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