This is a DOLOS Quick Detach Barrel System.

 Mil Spec Lower receiver
 KAK Pistol Blade Stabilizer
 DOLOS QD Barrel System with Pantheon Arms HGMC MLOC Handguard
 Dolos Handguard and barrel length 10"
 7.5" Barrel
 Caliber: 5.56 NATO
 Stock and upper length: 15 3/4"
 Overall pistol length 24"

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