It appears that he used an aluminum vinyl acetate stock assembly (or SP1 carbine lower assembly) with the SP1 Sporter upper assembly. It is hard to tell if the carbine pictured is a SP1 carbine with the XM177 FH/moderator or an XM177E2 build. The right side of the upper receiver would tell the tale. My guess is it is a SP1 Carbine. The barrel is too long for it to be an actual XM177E2.
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