I've seen videos of and read of incidents where the lock failed. So it can happen. Personally I'd never trust one.
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It’s political as I understand. I don’t own any smiths as they aren’t my thing. I like tigers. But the hate on the guns with locks is because Smith & Wesson Teamed up with. Hilldawg and Bill back in the 90’s. But no Forearm company is perfect so it no reason to shy away from them if you like them.
Being a fan of S&W revolvers, I personally find the lock ugly and ruins the appearance of the revolver. Would I own one, yes, I have had and have several. Nothing wrong with the gun, still a solid weapon, I just don't like the lock. I keep hearing about MIM parts failing and locks not working, but I have yet to have an issue and of all the guns with locks that S&W has sold, if there was an issue you would think it would be all over the gun forums.
There are S&W guys who hate the lock as I do, and will not buy them. Just like there are S&W guys that will not purchase any S&W that does not have a pinned barrel and/or a recessed cylinder. In my opinion, they are missing out on some fine handguns. The seven and eight shot revolvers are not P&R and they are fine handguns. Boils down to what you want. But I do not buy the argument that the locks are unsafe and MIM parts fail all the time. I believe that to be just talk. Oh, there has not been a recall for Smiths with the lock.
Locks introduce an additional failure mode in exchange for no benefit. If you want one, buy one.
The cable lock is far superior if you want to disable the gun. You will never confuse a cable locked gun with a ready to fire gun in an emergency, but it is impossible to tell if a internal locked gun is ready to go without close examination.