Let me try again to clear up some muddy water, by answering some of the questions that have been asked. I'll do it in no particular order, and, to keep this post from being longer than it already is, without including quotes from posts throughout this thread.
The investigation is being conducted by the Appleseed Oversight Board Committee, or AOC. I don't know the names of all on that committee. I have been told that they have been in contact with Smith & Wesson, but do not know exactly what has been said, nor by whom, nor when a full public report will be issued. I do know that I personally trust their good faith in this process.
Regarding the instructor who performed unsuccessful field repairs on a 15/22 rifle, I don't know his qualifications, nor exactly what he did, nor even his name. Nor do I know if he has been investigated or disciplined in any way. But I don't expect that any disciplinary action would be made public, or should be. I haven't seen any specific directives regarding instructors doing field repairs, but that might be coming.
Regarding any other rifles that are restricted, the only other restriction I know of is on .17 HMR semi-automatics, due to problems that many have experienced with early bolt opening on some models. This isn't the time or place to go into that in detail.
Regarding what will happen if a shooter shows up with a 15/22, he will be offered a loaner rifle or given a refund. The temporary ban is listed on the Information Page, visible to anyone researching or pre-registering for an Appleseed shoot. Those already registered are being notified as quickly as practical, and offered a loaner to use if they need one, or a refund on any fees paid. I expect that those who do not get the word, or just show up as walk-ons without having checked the information, will be disappointed. We'll offer them a loaner rifle, if available, and an apology for their inconvenience. As well as a refund if they have pre-paid. I think that's fair and reasonable, and I don't know what else can be done in that situation. Some sort of public statement will probably be released in the future, but I cannot guarantee when, nor what it will contain.
Have any other rifles ever shown problems at an Appleseed shoot? Of course they have. Do we have statistical records on all the many tens of thousands of rifles used by many tens of thousands of shooters, at thousands of shoots held at hundreds of venues, over the last ten years? And the rates of malfunctions for all, or even most, of the rifle models used? No, we don't.
That would be a monumental data-management task, certainly beyond our abilities during the early years of the program and probably beyond our abilities now. I don't think the effort would be justified. We're not trying to prove a case in court, or shut down Smith & Wesson, or have 15/22's banned, or any such.
We just have the informal observations of experienced folks, that this model seems to have more frequent, and potentially more serious problems, than other models. And we have had an injury, blessedly not a serious one, to a shooter. It seemed reasonable to our governing board that a more detailed investigation, and an interim ban on use of that model, was reasonable and appropriate. Better to err on the side of caution. And, personally, I agree with that decision.
Regarding this ban as an anti-black rifle move is just nor correct. See my response in Post #51. I stand by that, and can only add that I have seen hundreds of shooters use AR-15's and variants, AK-47's and variants, SKS's, Garands, M-1a's, FN-FAL's, etc. used at Appleseeds. The only rifle affected by this temporary ban is the S&W M&P 15/22.
Regarding the suggestion that a malfunctioning rifle be confiscated for a gunsmith inspection, I don't see how Appleseed would have the authority to do that. As disappointed as I would be if turned away from a shooting event for a disallowed rifle, I would be a hundred times as enraged if I went to an event, had a rifle problem, and the event operators took my rifle!
Regarding the problems with my personal 15/22, I have an older model that had a relatively low round count. It is absolutely out-of-the-box stock, except that I mounted a scope on it and a forward sling swivel. Using CCI Blazer 40-grain HV RNL ammo, which has performed well for me in other rifles, I began experiencing frequent misfires, maybe 1 out of every 20 to 40 rounds, more or less. Manually ejected rounds seemed to have light firing pin strikes. I also have had the rifle "double" twice, which led me to take it out of service. I have not yet had time to take it to a gunsmith or return it to Smith & Wesson for check out and possible repair, but expect to do that shortly. I am not expert enough to confidently diagnose the problem, but there were no apparent loose pins or other obvious causes, such as excessive fouling buildup in the action or chamber.
This will not answer all questions, but I hope it will put some of them to rest. Thanks to everyone for their understanding and patience. I'm confident that this will all be worked out, in due course.