Strike Industries is a US manufacture of high quality aftermarket firearm parts and accessories. Their line of magazine extensions are tough, durable parts that extend the capacity of your factory magazines. The line of magazine extensions are called the EMP series for Enhanced Magazine Plate. They are currently made for Glock, Smith and Wesson and Magpul AR-15 Pmags. At The Mag Shack, we carry the full line of Strike Industries EMP mag extensions at the best prices. These magazine extensions are affordable enough for many users to outfit all their factory magazines. Check out the line of Strike Industries EMP Mag Extensions at The Mag Shack.