I bought the BC stock for my relatively new 10/22. I had never disassembled the rifle until I went to place it in the new stock. As I went to put the action in, a plastic piece fell on the table. Looks like it's about an inch sqaure, with two of the corners rounded to give it a bull nose shape. Has 10/22 printed on one side of it and it looks like it may be a spacer of some kind. I can't figure out where it came from. I know I sound like an idiot but can someone please tell me what this is and where it goes?