The Magpul Tactile Lock-Plate is a practical magazine enhancement designed for quick and reliable loadout identification. Its raised tactile features with 1/8-inch ridges allow users to differentiate between various ammunition types such as ball tracer supersonic and subsonic with ease even while wearing gloves. Available in two configurations-Type 1 with a single ridge and Type 2 with double ridges-this innovative design ensures confident identification of up to three distinct loadouts. Compatible with standard PMAG 10/20/30 AR/M4 Gen M3 and PMAG AR 300 B Gen M3 floor plates the lock-plate maintains full functionality whether inserted in a weapon or stored in a magazine pouch. Made from durable polymer and finished in black it is a must-have upgrade for AR and M4 users. Note that it is not compatible with PMAG 40 AR/M4 Gen M3.