The L5AWM 300BLK magazine has been specifically designed for use with heavy subsonic .300 Blackout ammunition, especially with 200+ grain projectiles. Its updated internal magazine geometry allows these longer, heavier bullets to stack properly, enhancing feeding reliability compared to a traditional .223/5.56 magazine. The magazine body features distinctive .300 Blackout markings, and it ships with a contrasting flat dark earth floor plate for easy visual identification.Features :Optimized for 200gr+ Subsonic .300 BlackoutUpdated Internal Magazine GeometryDistinctive .300 Blackout MarkingsFlat Dark Earth Floor Plate for ID