This video details the process of installing an AR lower receiver, specifically the Lee Sporting LS5, onto a PTR9CT MP5 clone. It highlights the installation of a Geissele SDG3 trigger and Radian safety selector, along with addressing a common issue where the Geissele hammer may require polishing by a gunsmith to ensure proper bolt cycling. The presenter expresses satisfaction with the upgrade, noting the improved trigger pull weight and overall feel.
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