TESTED: The Repeatability of the AXMC and Era-Tac QD Mount 03 May 2018 Derek Rifles, Scopes (3) Ever wonder how quick detach rifle components and accessories affect the repeatability of precision shooting setup? Well Derek did - and he made a special trip to the range with the Accuracy International AX, Tangent Theta Scope, and Era-Tac QD Mount to get some answers. [More]