This is a discussion on Selector cut-out filler within the The M14 forums, part of the M14 M1A Forum category; I have a new Socom16 that I have dropped into a Fred's M14 Walnut stock. This being my first M14 I never realized how big ...
Okay....that goofy thought of mine just led me to a cheap but maybe decent looking solution. If you can still get the metal backed skate board/no-slip tape they used to sell at hardware stores.
Get the shortest piece they'ell sell you of the 2" wide stuff (that will probably be a foot long).
Now since I don't have a stock with an unfilled cut out I won't give measurements but I suggest a half oval or semi-circle piece cut to cover the switch cut out be cut from the material. Note: DO NOT remove the tape yet!
Prep the stock area around the cut with a little rubbing alcohol.
Next try and form it to the contour of the stock as best you can . This is why you need the metal backed as the plasticky stuff will want to spring back flat and not bend.
Some of the paper backing on the tape probably will be peeling off by now so go ahead and remove it. Next place the tape over the cut out laying it down from one direction only. I'd go from "top"(reciever area) of stock down. Once its down press and hold firmly for a min or two to allowed the adhesive to get a grip on the stock.
Some may think this is a "tacky" idea (pun intended) but it might not look half bad. And if you get around a 1 foot length you got enough for at least 4-5 re-tries if you goof up.
That's the only quick fix I know of that can be peeled off if you don't like it.
If you have the right tools you can craft one yourself it should not be too difficult, but will require patience. By the time you got the right material, fitted the plug, matched the finish, installed and sanded flush - $30 for a dummy switch will seem like a deal! http://www.sparrowhawkm14.com/id9.html I've got the FDS kit on the way myself
In the whole 4 weeks I have actually had an M14 in my possession... I'm learning as I go. Octanejunkie's link to SparrowHawk's dummy 'button' kit was in line with what I was looking for. I just didn't want a selector sticking out of the side of my rifle hanging up on stuff. I'm sort of a minimalist kind of guy, if it doesn't work or it isn't functional, it's out of here.
I will say that after looking at SparrowHawk's website I understand more about the M14 and it's stock. Now I know why there is a gap in front of the op rod that isn't in my synthetic stock from SAI (for the connector arm.)
I bought a couple with the lock, instead of the switch. Looks sharp and most USGI M14's were issued that way. Usually two per squad got the selector switch. Most came with the connector lock, semi-auto only as issued. Others have used brass brads nailed and bent in the hole and used Bondo. It seems to stain and be more pliable than wood putty. Most leave the hole. I have never had anything fall in there and the rifle is far from sealed anyway. Have fun, enjoy the forum and take your time. It's certainly not something that must be fixed before shooting.