HI all. My dad's Ted Willam's Mod 21 (High Standard) seems like it is not setting the firing pin or maybe the sear is not releasing. I am not sure how this occurred. It functioned fine last time out like it always has. Only thing I have done is put a plastic down in the magazine for dove season. I noticed it as I just did that yesterday. I can't imagine that should impede it. I took it apart and gave it a good cleaning when I inherited it, but it did fine after that. I no I didn't take the trigger group apart. Ideas? Thanks.