The E3 bolt is the primary reason to get a KAC. You can do everything else they do besides that. Its not like people don't know what gas port sizes they use or what the Mod 2 gas system does or what their buffer weights are. At some point someone in other businesses said F it and keep pumping out what should be $800-1200 guns for $1500-2000+
The Sig MCX is the only platform I can see derailing anything.
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