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For a few years Remington made rifles and shotguns with an integral lock, shaped like a J. On shotguns, its on the safety, on rifles its on the bolt shroud.
Here is a firing pin assembly with a J lock...
Here is an aftermarket Lightweight pin assembly, no J lock...
It made the gun in-operable when it was locked. It would lock the safety on, on the shotguns. On the rifles, it would lock the firing pin. Not only that , but lock at the piece of crap spring on it...
The J-lock de-values a firearm, which is why guys will say that in their post. Nobody wants it.
If you own and carry a Jlock model in the field, be sure to carry the green key with you, as the common practical joke is to lock the other guy's rifle before it leaves the truck. Or buy an aftermarket bolt shroud.