This Marlin manufactured barreled receiver is for the model 55 Swamp bolt action shotgun in 12 gauge with a 2 3/4" chamber and a 24" long ported barrel. This barreled receiver is in very good condition retaining a mixture of thinning original blue finish with a brown patina and light wear. Barreled receivers must be sent to a federally licensed firearms dealer or pawn shop and do not qualify as a C&R based upon BATFE's guidelines. (file photos)