I think it needs to be a WTB ad.
No easy way to tell by searching for "remington 870" whats what without looking at each one, even then they don't tell you what the sn is.
EDIT: and if you find one, post dibs here so we all don't end up bidding against each other
WTB: HK21A1 & HK13E parts
WTB: Project & fixer upper guns: Old beaters needing some TLC, C&Rs, Mauser's, Colt's, Beretta's, & HK's