Whilst picking up after cleaning the following pistols I have the dreaded leftover mystery part. Ruger MkII 1911A1 Beretta 92F Colt Anaconda (is stainless so pretty sure it ain't from that). I've torn down the first three again but not seeing where/if this belongs. I know it was not on the bench before starting because I was working on a towel that I'd shaken out numerous times prior to starting. It is roughly 5/16" long by 1/8" diameter. Any ideas where it might belong?