Configure your FoldAR upper assembly with our Aero Precision-built lower assembly for the perfect high-quality single folding pistol. Combine FoldAR uppers with barrels less than 16" to this pistol-brace lower assembly in order to maintain compliance with NFA regulations relating to "Short-Barreled Rifles". Do not install vertical forearm grips onto a pistol lower assembly. Do not modify a pistol stabilizing brace in any way that would facilitate use as a shoulder-fired weapon. DO not extend any pistol stabilizing brace past 13.5" length-of-pull (the distance measured from the trigger-pull to the back-end of the brace).
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