This guide details the assembly and tuning of a custom Sig P320 Ultimate Duty build, incorporating aftermarket parts for enhanced performance. It covers the installation of a Brouwer Solutions M1811 grip, Align Tactical controls, an FDEZ compensated slide with a Killer Innovations barrel, and accessories like a Streamlight TLR-1 HL and Trijicon RMR. The process includes troubleshooting common fitment issues and reliability tuning, drawing on the expertise of a seasoned firearms reviewer.
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