Bobro Engineering Compact ACOG Quick-Release Scope Mount The ACOG mount is precision CNC Machined from a block of 6061 T6 aluminum and finished in hard coat type 3 Mil-Spec anodized black for a rock hard lasting finish Best QD lever locking System on the market Precision Machined in the USA Fits: 1.5x16S, 1.5x24, 2x20, 3x24XB (Crossbow) and 3x30 ACOG models