you can do that, i have, as have many others, i used epoxy on the outside of the buffer tube, filled the buffer tube slot where the stock detent, or adjuster locks into place, and assembled in the desired position, let dry, cut off the adjuster stud, and finally pinned the adjuster handle, and stock in place, five on the stock, two in the handle, and a ton of epoxy, i have spoken to the alphabet cops about this a few times, they told me that what they were looking for is a solid feeling stock, simple pins would not do the trick, you must epoxy, they told me that they would write me a letter of approval if i sent in a sample along with a description of the procedures, you can also get a metal/aluminum unit and weld in place, this is the preferred method for the alphabet people, the pinned/epoxied unit has to be utterly destroyed to make a change in the position, takes hours, and that is what they want