stock lock

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box lock

A metal door lock commonly encased in a flat rectangular box, often fabricated of brass; mounted on the interior surface of a door.
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Under the stock lock ring unit is the picturesquely named drop-deviation plate, which performs both the familiar function of regulating drop and cast and also serving as the rear mounting point for the lower receiver.
The side-folding triangular stock locks solidly in place.
Avganim says to be sure to stock locks with metal parts, not plastic.