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Emanuel, Attaching an AR-15 pistol upper assembly to a lower with a fixed or collapsible stock would make it an SBR. Rather than write an essay here, this article should help you >>> https://veriforcetactical.com/2019/04/18/ar-15-pistol-legalities-on-building-and-converting-lowers-and-rifles/ .....Have a great day!
Emanuel, it is for a Rifle due to the Shoulder Stock. A Braced lower would work no issue on a Pistol build. The Shoulder Stock would make your upper an SBR (Short Barreled Rifle) requiring NFA Registration and a $200 Tax Stamp. Cheers and stay safe!
Rifle.... cannot put pistol upper on with current stock (unless you obtain SBR stamp).
This should help... https://veriforcetactical.com/2019/04/18/ar-15-pistol-legalities-on-building-and-converting-lowers-and-rifles/
This lower is meant to be used for a rifle build, not a pistol. This has a stock on it , you need one with a pistol brace for it to be legal. Sorry but hope this helps.