37 winWinchester Model 37 Red Letter 28 Gauge Description: This is a used Winchester, Model 37 Red Letter 28 gauge shotgun Is a single shot with a break open action It has a 28 full chokeBulk Ammo 9mm 6.5 Creedmoor.223 Rem 5.56x45mm NATO.308 Win 10mm Shop All. ... Winchester 37 - For Sale :: Shop On :: Let us help you find the best options