Mission First Tactical Magazine, 223 Remington/556NATO, 10 Rounds, Fits AR Rifles, Polymer, Black 10PM556BAG-BL This MFT magazine features a long-life stainless steel spring and four-way anti-tilt follower to ensure reliable feeding. The oversized bolt catch notch in the rear of the magazine provides enhanced reliability of the bolt catch operation. Simple tool less disassembly with double floor plate safety release tabs allow the user to safely release spring tension during disassembly and quick ammo dumps.