Rafsob, sorry to hear that. Like Slack, I ordered two and they arrived in good shape. I did notice that they were not as polished as others I have bought, but they both screwed in by hand without modification.

The MU plug has been very useful in almost eliminating all blow back as well as making almost any 209 primer ignite BH209, even the vari-flame adapters with small rifle primers in them.

I can remove all spent 209 primers with my fingers. I have not experienced any stuck primers. One o-ring has lasted over 50 shots for me. The o-rings are #60's (if I remember correctly) and can be bought from Lowe's in a 10 pack for a couple of dollars.