This Silencer Hazard Map Brief documents the free field blast overpressure hazards from the SilencerCo Saker 556 and HUXWRX FLOW 556k fielded on the 10.3-in MK18 AR-15 semiautomatic rifle firing M193 55gr 5.56 NATO ammunition, as evaluated in technical Report 6.53 and Report 6.83 and as tabulated in record numbers 7.1.53 and 7.1.82 in the Rankings, respectively.