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Hi Joseph and welcome. A Pistol Brace would not change the classification to an SBR needing NFA registration or $200 Tax Stamp. Picatinny Adapter here : https://hkparts.net/all-parts/hkp-hk-416-22-picatinny-pistol-brace-adapter-stock-adapter/ ------------------------------------------ Picatinny Brace here : https://texasshooterssupply.com/product/sb-tactical-pistol-stabilizing-braces-picatinny-tf1913/