the PMAG 40 GEN M3 is a polymer magazine for AR15/M4 compatible weapons. It features a long-life stainless steel spring, a four-way anti-tilt follower and constant-curve internal geometry for reliable feeding, and simple tool-less disassembly for easy cleaning. In addition, a redesigned bolt catch notch in the rear of the magazine provides increased bolt catch clearance, while an over-travel stop on the spine helps ensure the magazine will not over-insert on compatible weapons. Low profile ribs and new aggressive front and rear texture gives positive control of the GEN M3 in all environments, and a paint pen dot matrix has been added to the bottom panel of the body to allow easy marking by the end user for identification. The new, easy to disassemble flared floorplate aids extraction and handling of the magazine while providing improved drop protection, but is slightly slimmer than before for better compatibility with tight double and triple magazine pouches. NOTE: This item is also compatible with HK 416/MR556A1/M27 IAR, British SA-80, FN SCAR~ MK 16/16S, and others. Specifications for Magpul Industries PMAG GEN M3 AR-15/M16/M4 .223 Remington 40 Round Rifle Magazine: Manufacturer: Magpul Industries Color: Black Fabric/Material: Polymer Magazine Capacity: 40 Round Cartridge: 5.56x45mm NATO, .223 Remington Gun Make: AR Platform Gun Model: M4, AR-15 Quantity: 1 Pack Features of Magpul Industries PMAG 40 AR/M4 Gen M3, .223 Remington, 40 Round Rifle Magazine Next-generation impact and crush resistant polymer construction Long-life stainless steel spring Ribbed gripping surface and new aggressive front and rear texture for positive magazine handling Modified dimensions allow for wider compatibility with non Colt-spec platforms Constant-curve internal geometry for smooth feeding Anti-tilt, self-lubricating follower for increased reliability Over-travel insertion stop on the spine Ribbed gripping surface and new aggressive front and rear texture for positive magazine handling Paint pen dot matrix panels on the bottom of the body for easy identification Flared floorplate aids magazine handling and disassembly, yet is slim enough for use with many double and triple pouches Package Contents: Magpul Industries PMAG GEN M3 AR-15/M16/M4 .223 Remington 40 Round Rifle Magazine