You are almost right. The W means it is destined to be shipped to wal-mart. It replaced the AW and is stocked in hardwood and NOT walnut.
ORIGINAL: savagescout
If u mean the model 336 C,W,or A in 30-30. The catolog I have for 2007 states the
336 C has a black walnut stock with fluted comb / rubber rifle butt pad / comes in 30-30 or 35 rem.
336 W has a walnut stock / hard rubber butt plate / and comes with a nylon sling and optional 3-9 scope mounted
336 A same fetures as the "W" without the sling. the W and A only come in 30-30.
Hope this helps all of the wording is according to Marlins catolog and different manufactures will describe features differently. And these are the features that set them apart all come in 20" barrels 6 shot magazines etc......