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The 20/20 Stabilizer Kit with Arm Brace is ready for use out of the box. It uses your firearm's built in sights and is made from glass reinforced polymer. The kit includes a Stabilizer Frame, folding Brace w/Strap, UCH & GCH17 Charging Handles (low/high profile), Sling, Picatinny Side Rails. This model is compatible with multi gen Glocks.