FIB, The shell carrier may not be chromed. My Wingmasters carrier got real scratched up so I rubbed it out with some jewelery polish. It came out like a mirror. Chances are someone did the same to the one you're looking at.
Maybe the lifter has been changed or the complete trigger assembly,if I remember correctly they were chromed in the earlier mods. of Wingmasters. When they started making other versions they went to blued ones. Mine are chrome. Ross Puls
FIB, I have a Rem. 870 TB Trap Wingmaster that I got second hand and had Rem. check the numbers on to find out date made and it is a 1984 gun. It has the chrome carrier bolt. I don't know when they changed from chrome to blued. Breake-m all. Jeff