Anytime you add a shoulder stock to a pistol it requires registration as a short rifle. The definition the ATF uses to describe a short barreled rifle is a weapon with a shoulder stock and a barrel length of less than 16" or overall length of less than 26". It doesn't matter if the stock is easily removable or nearly impossible. Registration is not too difficult and can be done by filling out a form 5320.1 in duplicate, getting a set of fingerprint cards from the ATF and then having the chief law enforcement official in your area sign the forms and get the prints done. You also need to file a stupid form called a citizenship certification form with which you certify that you are who you are and that you further certify that you are certifying that. Mail all that off to ATF with a check in the amount of $200 made out to US treasury and wait. Once the form comes back with a pretty green stamp on it you can attach the stock.
I've been a class 2 manufacturer for about 9 years now and deal with this paperwork all the time. I'm not a lawyer so legal advice is worth what you paid for it but I do have some experience with the NFA regs.
I did a glock 21 using one of the heavy fixed stocks and it is far better at long range and much better at close range when compared to the hand help pistol setup. I let a police dept try the thing out and they wanted stocks for their glocks. Unfortunately the solid stocks they wanted were no longer available.
I hope that answers your question.
Frank
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