How to Remove a Mossberg 500 Stock (4 Steps)

Check that the shotgun is unloaded by placing the safety and the 'on' position, pressing in the slide release (located next to the trigger housing), and opening the action by pulling back on the fore-grip.
Use a standard size Philips head screwdriver to remove the screws holding the butt-plate (the rubber pad on the end of the stock) in position and remove the butt-plate.
Look down the exposed hole on the rear of the stock and determine the bolt head configuration (some Mossberg models have a slotted head and some utilize a 1/2-inch hex head).
Use your standard screwdriver or your Allen wrench (depending on which configuration you found) and remove the bolt by rotating it counter-clockwise. The stock will now come off the receiver.