This guide details the construction of a custom .300 Blackout 'Hitman' inspired briefcase gun. It emphasizes using a Halliburton Zero case with custom foam, a short KAK barrel, a 3D-printed lower receiver, and a manual straight-pull bolt action. The build is designed for suppressed, subsonic .300 Blackout ammunition and includes mounting an ATIBAL STD red dot sight and a folding brace.
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