Jack, the stock will fit a 12 gauge Maverick 88, however the forend will not as the forend on Maverick 88 is setup differently compared to the 500/590. ------ google.com/search?biw=1280&bih=596&tbm=isch&sa=1&ei=GkmOXMr6D8vl_QbI0JXYBg&q=maverick+88+security+12+gauge+foreend+removal&oq=maverick+88+security+12+gauge+foreend+removal&gs_l=img.3...54362.60733..61168...0.0..0.79.1048.16......0....1..gws-wiz-img.......0i5i30j0i8i30j0i24.3j7BW88owzg#imgrc=eFOmAUl-z85Z4M:

Jack - if it states it will fit the 500/590 series, then it will fir the Maverick 88. The trigger groups will not interchange between Maverick 88 and Mossberg 500 models, but the majority of other parts, including barrels, stocks, and magazine tubes, will (the barrel and magazines must be the same length).