This review covers the Standard Manufacturing GS4, a .22 Long Rifle firearm inspired by the Thompson Tommy Gun design. The video details its unique features, including a straight-wall magazine, top-mounted charging handle, and modular M-LOK/KeyMod handguard. The reviewer highlights its reliable performance during range testing and discusses its construction, trigger pull, and disassembly for cleaning, noting the 10-screw process for separating the polymer and aluminum receivers.
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