Trijicon ACOG Flat Top Picatinny Mount Rail Adapter. Trijicon Mount Rail Adapter fits Trijicon ACOG Compact Combat Optical Gunsight with Flat Top Picatinny Mount and rotates the scope out to clear the bore. This keeps the scope clear over the bore which reduces the chances of a stray light beam. Trijicon ACOG Compact Combat Optical Gunsight with Flat Top adapter works for Trijicon ACOG Compact Combat Optical Gunsight with Flat Top adapter requires no rezeroing and does not lose the "drop-in fit" necessary for direct attachment of the Trijicon rail adapter. Specifications for Trijicon TA51 ACOG Flat Top Picatinny Mount Rail Adapter: Manufacturer: Trijicon Color: Black Gun Make: Colt Condition: New Trijicon TA51 ACOG Flat Top Picatinny Mount Rail Adapter TA51