Sig 516 AR Pistol and Brace
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With the introduction of the AR pistols, most major manufacturers have come out with their own line of AR pistols. Sig started out with a direct gas pistol and now has added a pistol to their 516 family of external piston operated weapons. The Sig 516 pistol started off as the 516 PDW, which was an SBR. This particular 516 pistol is equipped with the controversial Sig brace.