This review covers the Free State GunCo SAS-9, a machined aluminum production firearm based on the 3D-printed 'Mac & Cheese' design. It highlights the firearm's compatibility with MAC uppers and AR lower parts, its direct blowback operation, and its ability to accept Glock magazines. The review also discusses trigger compatibility, potential issues with outrunning the trigger, and recommendations for lubrication and maintenance to ensure reliability.
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