To complicate matters further, and to demonstrate that Winchester would make whatever the customer wanted (what a concept!), I have a 2 barrel 20 ga. M21, which the Cody letter says is a skeet grade gun ( it has the longer forearm) but the two barrel sets are 26"I/C and Mod, and 28" Mod and Full. The "Skeet" stamp is missing from the floorplate. BTW, both sets of barrels are chambered and marked for 3" shells.