This isn't true. Breech plug needs to be modified or replaced with a Blackhorn compatible plug. We have learned this the hard way. You probably have used the standard plug with Blackhorn a few times, and it worked just fine, is why you have this opinion. I too shot Blackhorn many times with the standard plug. When one least expects it; there will be a hang fire...............................many of us had this happen at a very inopportune time. This is not my opinion, it is fact.