New & unique magazine – provides a clear window on both sides (showing the number of remaining rounds) & a full magazine indicator pop-up pin on the bottom. Indicative Magazine For 5.56 Bright & clear white polymer indicator. In the base, a thumb-touch pop-up pin, so you can always know if the mag’ is fully loaded. 30 rounds 5.56X45 (.223) magazine. To reduce the spring’s pressure, for your own choose, you can convert the magazine to fit 29 rounds. High impact polymer. Lightweight & rustproof.