Breech Block Failure 1916/1920 Erfurt

[Allen Brett]

Hello,

I just picked this Luger up over the weekend. I disassembled the pistol and proceeded to clean, check all the parts, lubricate then re-assemble. All of the parts were numbers matching in excellent shape with a great bore and no issues other than standard exterior wear. I just came back from the range where I had fired 3 magazines of 124 grain factory "Blazer Brass" ammunition and noticed this when I went to clean it.

I see no other damage and it still cycles no problem. I assume old metal, probably not safe to shoot as is and I need a new breech block? No other damage was found and I did not notice anything unusual while I was firing the pistol. The block is matching to the gun and marked "57". Any input is appreciated, thank you.