Elliott Delp and Sparky review the Primary Arms MD-21 (SLx) and MD-21S (GLx) red dot sights. The GLx model offers a solar option and advanced ACSS reticle configurations for an additional $40-$50 over the SLx model, which features a standard 2 MOA dot. Both optics are praised for their value and feature a 2 MOA dot, 12 illumination settings, and Aimpoint Micro footprint.
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