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...I don't like the double o-ring set up PITA so I have a friend who has used this set up glassman98 , so here's what I did, I used a Vortek HW breech seal the one Tom makes not a factory seal! Tom's are allot harder and that's what is needed for sliding compression tube rifles! I think his current lot are black? the one I have is red but I've had it for a few yrs anyway I used a 30 thousands shim under the seal and it has a nice feel when closing up the breech