This product is so simple, it’s brilliant. Missouri Tactical created a silicone rubber plug that fits over the hollow end of a Magpul MVG/RVG rifle foregrip and creates a water-tight storage space. Moreover, moulded into the plug itself is a slot that securely fits a CR2032 coin battery and a hole to hold a small (2mm-4mm) Allen key. Not only is this useful but its cheap. Its a perfect stucking stuffer for your 2A friends and family.