This Winchester manufactured late variation blue finished carrier plunger is for the model 1200 slide action shotgun with serial number above 382,500 and is in very good condition with light wear. (file photo)
Note: Firearms with the following serial numbers in both 12 and 20 gauge have been observed with this part: 476588, 477680, L566101, L646073, L1106639 & L1188757.
