Optic-ready handguns have pre-machined slides with mounting plates or cutouts for red dot and reflex sights, so no additional machining is required. The raised sight plane keeps co-witnessed iron sights usable when an optic is mounted. Models span compact, full-size, and micro-compact frames from makers including Glock (MOS series), Sig Sauer (P320 RX), Smith & Wesson (M&P CORE), and Springfield Armory.