Please see questions answered within the quote.So, by removing the flag, that disables the lock from engaging itself under recoil?
Yes. The lug that actually locks the hammer is a little lump on the side of the "flag" itself. Remove the flag, you've removed the lug, and it cannot lock. That's all I've done, so far, to my 340PD lock.
If the spring for the fork were to fail, what could possibly happen?
The fork spring is a coil, compression spring. With the plug in place, the spring is almost fully compressed, with no place to go, best I can tell. If it collapsed and lost all spring tension (HIGHLY unlikely) in theory, the fork might be able to move forward enough to release the plug, but the spring is so close to going solid with the plug in place, I'm not sure it would release. If it did, at least in my 625, I think the result would be a plug that floated back and forth in the hole a little, but I don't think anything would hang up. If the fork itself could get loose, it might hang something up, but it doesn't look to me like it could get loose into the internals.
I don't suppose the spring could fail, but how long could that spring stay at the proper tension to keep the Plug in place? 10 years? 20 years? 30 years?
The "proper tension" of the spring is not going to be critical. One thing for certain, the likelihood of the plug or fork coming loose for any reason is a HELLUVA lot less than that of the flag locking up the gun. If anyone with a remotely mechanical bent looks closely at the unmodified internal lock, he marvels at why they don't self-lock more often than they do.
Many folks have done so, and many more feel as strongly as I do, some even more. (I do own two Smiths that originally were equipped with locks. I know a number of folks who love Smiths, but won't own one that ever had a lock.) However, one should remember that S&W is owned by Saf-T-Hammer Corporation, a British company. No matter how polite, rational, logical, loyal, trustworthy, obsequious, purple, clairvoyant*, pretty or sexy one might be with letters and e-mails, Saf-T-Wesson won't care. As long as people keep buying the lock-equipped guns, they won't change.If you feel so strongly against the internal lock, you should call and email Smith & Wesson to let them know.
Be polite, obviously.
Many folks have done so, and many more feel as strongly as I do, some even more. (I do own two Smiths that originally were equipped with locks. I know a number of folks who love Smiths, but won't own one that ever had a lock.) However, one should remember that S&W is owned by Saf-T-Hammer Corporation, a British company. No matter how polite, rational, logical, loyal, trustworthy, obsequious, purple, clairvoyant*, pretty or sexy one might be with letters and e-mails, Saf-T-Wesson won't care. As long as people keep buying the lock-equipped guns, they won't change.
*With thanks to Steve Martin.
What the management of smith needs to understand is that this is America. And in America we don't buy guns solely because we need them, we buy a lot of guns because we want them.
This in turn means the market is not finite. You can increase the number of guns sold, if you have guns American want. Don't all raise your hands, but how many have guns they really don't need, but have simply because they want them? Yes we use and enjoy these guns, but we don't need them.
A lock to myself and many others is a turn off in regard to buying what is a discretionary purchase.
I just had an Internal Lock Failure today when range practicing with my concealed carry weapon a 642-2. Why do I need a concealed carry weapon which is fundementally unreliable? Never mind liking or disliking a gun. This is a personal defense weapon which is carried to protect life. This is not some range toy.