Primary Arms MD‑21 Red Dot Test | Solar vs Standard Options
This guide covers the installation and zeroing of Primary Arms MD-21 (SLx) and MD-21S (GLx) red dot sights. It details selecting mounts, attaching the optic, powering on, and adjusting for zero using 0.5 MOA clicks. The guide emphasizes safety and highlights features like the ACSS-CQB reticle and solar power option on the GLx model. Instruction is provided by experienced gear reviewers from Elliott Delp's channel.








