Breech Block issues

[luscioman]

I have 4 different shooters that i like to take the range. At this point all 3 have a damaged breech blocks. The rear of the breech block that is worn down/broken where the firing pin retainer presses against block when it is in the locked position. I spent some time looking on the site but cant really find if there is any way to fix this or if i have to just get new breech blocks. Below is a picture of one of them. As you will imagine the firing pin spring and retainer just fly out when you turn it. Below are some pictures of this.