The Trijicon Mount AC12004 ACOG 6x48 Flattop Rail Adapter with Colt Style Thumbscrews is the purpose-built mounting solution designed specifically for attaching the Trijicon 6x48 ACOG riflescope to the Picatinny rail on a flattop M16 and AR15 firearm - the factory-correct adapter that gives serious 6x48 ACOG users the secure, stable flattop rail attachment that tactical and precision applications demand from the mounting interface between their ACOG and their weapon platform. The ACOG mount AC12004 is specifically designed for the 6x48 ACOG configuration's unique housing dimensions and mounting requirements on flattop M16 and AR15 receivers - the purpose-built fit that ensures correct alignment, proper dimensional engagement, and the stable attachment that the 6x48 ACOG's extended magnification capability and precision shooting application demands from its mounting solution. For 6x48 ACOG owners who run flattop AR and M16 platforms, the AC12004 is the factory-correct adapter for proper installation. The Trijicon Mount AC12004 Colt style thumbscrews provide the familiar, proven attachment mechanism that experienced AR platform and M16 operators specifically prefer - the tool-free installation and removal that the Colt thumbscrew design delivers for routine mounting and dismounting operations without any tools or complicated procedures required. The Colt style thumbscrew attachment gives the AC12004 the practical, intuitive installation experience that serious tactical and competition shooters who regularly mount and dismount their ACOG specifically appreciate. The ACOG mount AC12004, with T6 aluminum construction and a Mil-Spec anodized matte black finish, delivers the secure, stable attachment and corrosion-resistant surface treatment that serious tactical ACOG applications demand during hard field use and operational deployment. Features: Purpose-built for 6x48 ACOG on flattop M16 and AR15 platforms Colt style thumbscrews for tool-free installation and removal T6 aluminum with Mil-Spec anodized matte black finish Secure stable attachment for precision tactical applications Factory Trijicon dimensional precision and correct fitment Designed for flattop Picatinny rail platforms Trijicon ACOG 6x48 Flattop Rail Adapter w/ Colt Style Thumbscrews AC12004