Well you should keep in mind you could get someone in trouble by posting its ok. I looked everywhere, even on the ar15 fourm and NOBODY has a letter from the batf saying that. Just a bunch of wanabe experts with opinions. Opinions that could easily get you room and board at the fed pen. The latest batf rulling on folding stocks wasn't even about handguns it was about full sized guns. It was made so that if you had a shotgun with an 18 inch barrel and added a folding stock it would be no longer legal because a full sized gun is measure with the STOCK (no mention of arm brace) folded. It would then have to be registered by the batf and a 5 dollar stamp paid. Same with a full sized rifle. It makes them "non guns" and they have to be registered as other. You either have to buy them and register them at that time or apply for a stamp and get it before you install the folder. Pistols? About everywhere I see opionions (again for what there worth) says its measured by the batf at its longest mode. If it has a 4 position stock it measured all the way out. If your at the range with a flash suppressor on it that's the way they measure it. Again theres no letter saying that. the batf isn't going to write one either. It gives them latitude in who they arrest and who they don't. Just went though it with registering a ar handgun in Mi. Nobody knew what need to be done. Not the dealer or the sherrifs dept. So the sherrif, dealer and I got together on the phone with the dealers batf contact. He asked him and what he said was the batf basically could care less. That is unless your a school shooter or a bank robber. He said that's where the "other" thing came from. It was a way for the batf to sidestep making rules. He said register a ar lower as other and they don't care what you do with it. Again they don't care until they want to care. He said if they make more restrictive laws the gun owners would go nuts and have them in court. If they made less restrictive rules the liberal democrats would have them in court. He told us we were nuts if we thought hed give us an answer he had to stand behind. So if you have access to a letter that is specifically aimed at folding stocks on handguns on batf header paper that says in plain words an ar handgun with a folding stock is measured folded id sure like to see it. I spent an hour searching and sure didn't find that letter.