Probably the Swing lever is the most secure, but I simply don't like them! My favorite is the DEELEY lever (pull out lever)But some "EXPERTS" say they are inferior to the swing lever, and may be. The Anson plunger release ( push-rod) works fine, but if it jams in anyway, the only fix is to take chisel and split the wood to get to the works of it. There is another one, from older rifle days, and is a hold over from the muzzle loader days, and that is the cross wedge. Unless you are simply into nostalgia, this one I would leave in the store! I have double rifles with all four fasteners, but the wedge type is actually on a muzzel loading double rifle, so is appropiate for that rifle.

I DO NOT however own a double rifle or shotgun with a beavertail fore-end, nor will I own one with out modifying the fore wood to as near splenter as I can get!