Strike Industries Polymer FSA Picatinny Folding Adapter with Adjustable Stock

This is the Polymer FSA in its stock configuration: a folding adapter that clamps to a rear 1913 Picatinny rail and carries an adjustable polymer stock. It folds to one side on a button release, and the adjustment lever sets length of pull without tools.

The stock uses a rubber butt pad and an angled down stock bar, which drops the toe out of the way when the gun gets shouldered from awkward positions or over a barricade. Polymer construction keeps the assembly light for a folding setup, and the Picatinny mount means it goes on anything with a rear rail instead of one specific receiver.