At a glance, a folding stock or collapsible stock is one that is not fixed permanently and does not remain static, when referring to the length thereof.

One of the many intended uses of a folding AR-15 stock is to enable the shooter to alter the length of their particular trigger pull.

An important consideration to bear in mind is that all folding stocks are collapsible in nature, but not all collapsible stocks are able to fold.

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