The Accurate-Mag short action magazine extension is the ideal solution for extending the capacity of your AICS magazine. These extensions add 4 round capacity for .308 and 6.5 Creedmoor and +2 for 300 WSM and 6.5 PRC and a positive grip for mag extraction. It is also easily installed by sliding off the old floorplate, depressing the spring and sliding on the extension. Then screw on the backplate and its ready to go. These extensions are compatible with any steel AICS magazines, excluding .223 magazines.