...very briefly, the ADL has a "blind" magazine, meaning no floorplate; stock is solid wood underneath the magazine; BDL has the floorplate underneath with trapdoor latch to release the floorplate, spring & follower; also, the BDL has "fancier" features such as black forend tip etc... Classic has the BDL bottom metal, but the stock is "classic style" with no Monte Carlo or forend tip, matte finish metal etc... hope this helps... Larry