The G3 foregrip is meant to give your marker the appearance of the formidable H&K G3 assault rifle. The G3 is one of the most widely recognizeable rifles in the world, and is still in service with many countries.
Our G3 foregrip is meant to accomodate the X7 owners who like the look of a "long rifle." Though a 12" barrel will just clear the end of the foregrip, it is recommended to use at least a 14" barrel with the G3 foregrip to make it look right.