Originally Posted by Tallyglock
Just saw this thread and thought I would add my 2 cents. I purchased a brand new Gen III 21SF three weeks ago and took it to the range and shot a wide variety of ammo. I lost count after 30 to the face. The one thing I found odd was that all the brass was scorched and I mean really burnt on one side of the casing. I showed it to my armorer and he was thinking the casings were not sitting properly in the barrel. Sent it back to Glock at the begining of the month and called to find out the status of the pistol. I was told the pistol could not be fixed and I was being sent a new 21SF.
I would have loved to have been present while they were working on it. I too have a Gen3 21sf that started out with BTF. I removed some from the extractor step and removed some from the back side of the claw and it seems to work ok with a little bit heavier reload. Let me know if you learn more and/or how the new pistol does.