MISSION FIRST TACTICAL, LLC EXD 5.56x45MM NATO POLYMER RIFLE MAGAZINE FOR AR-15/M4 MFT EXD Polymer Magazine. Utilizing new material technology and manufacturing processes for enhanced strength, durability, and reliability to exceed demanding military performance specifications. Designed for the AR15/M4 but allowing use with a wide range of non-AR15/M4 platforms. FEATURES 25% Stronger vs previous Long Glass Fiber Polymer 60% Higher Impact Strength vs previous Long Glass Fiber Polymer 2nd Generation Long Glass Fiber Polymer Enhanced Strength & Durability Ribbed front and rear gripping surface Long-life USGI-spec stainless steel spring Four-way anti-tilt self-lubricating follower Improved two-point follower stop design Flared floor plate Oversized bolt catch Tool-less disassembly with double floor plate safety release tabs .300 BLACKOUT VS. 5.56 NATO DISCLAIMER While .300 AAC Blackout (also known as 300 BLK) and 5.56 NATO cartridges are designed for use in AR-style rifles, they are not interchangeable and must never be confused or cross-loaded. Firing a .300 Blackout round in a 5.56 NATO chamber can result in catastrophic failure, as the larger diameter of the .300 BLK bullet may not fit properly in the 5.56 barrel—leading to a barrel obstruction and potentially serious injury or damage. Though both cartridges can be used with similar bolt carrier groups and magazines, it is critical that shooters take extreme care when switching between calibers, especially when using rifles with interchangeable uppers or multi-caliber setups. Always verify the ammunition you are loading matches the markings on your barrel and upper receiver. Mixing up .300 Blackout and 5.56 NATO can lead to dangerous malfunctions, injury, or death. When in doubt, double-check.
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