I just bought a used Browning Buckmark Gold and I took it to the range to test it out and it keeps misfiring. So when I disassembled it, I found a broken piece of plastic piece that fell out, but I have no idea what it is. The rear of the pistol ( inside the slider ) also looks like it has some chipped plastic piece, too. Can anybody help me find out what it is so that I can replace it?

