In theory, 1-6X variable power optics appear to be an ideal choice for 14½- to 16-inch barreled 5.56/7.62 carbines and have continued to gain popularity as more models have become available. The 1X setting provides quick close-range capability, while the top end delivers the magnification needed to reach out to the maximum effective range of these platforms.
However, like any optic designed to cover a wide range of variables, there are a few drawbacks to consider:
- On 1X, a variable-power optic will never be as fast as a red dot sight. Your head position needs to be more consistent and you’re still looking through a long tube, where parallax is more of an issue, as is the potential of scope shadow.
- With few exceptions, variable-power optics have yet to achieve true daylight bright reticles. This is due to the complexity of how light is projected onto the reticle and viewed by the eye.
- Most users of low-power variable optics use only two settings, minimum power and maximum power, which requires the user to twist a power adjustment ring.
A better mousetrap
Source:: Guns and Ammo