can I buy yours and order one for your replacement?
No you can't!
Years ago I had a GPR with the same problem you face of needing a longer screw, and one of the fellows on the old MLML site mailed me two; one went on my rifle and the other sat in my parts box until I could pass it on to someone else in need, which was you. We all take care of each other, just pass the favor on to someone else in need some time.
AS far as the chicken goes, I'm sure I missed it and figured one out of three on her. Having had chickens, I doubt if she even noticed how close it came!
Probably stuck her head up and looked around to see what that noise was, which is why my third shot got her...
~WH~