Looking thru the parts box for a bolt to go in a RR serial# Remington 700 SA Receiver. Found what I thought was an old style from .308. It was too short! Now, I can't remember what it came out of? Here are a couple of pics of it next to a newer .308 (Remington 700) bolt. Please help me identify what it is! Got a headache trying to think back to the 70's - 80's when I assume it went into the parts box??