This video tests three subsonic 300 Blackout ammunition types (Federal 220gr, Hornady SubX 190gr, Hornady Black 208gr AAX) with a Sig Sauer Rattler LT and Surefire 300 SPS suppressor. It evaluates grouping size, noise, and flash suppression, noting the importance of an open-tine muzzle device for suppressor compatibility and the Rattler LT's 1:5 twist rate for stabilizing subsonic rounds. The Sig lower receiver proved more reliable than a conversion kit.
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