Thermold Twin Mag M16 AR-15 30 Round Magazine Joiner
Thermold Twin Mag M16 AR-15 30 Round Magazine Joiner is a magazine lock that will hold two of them together while shooting. Hold another magazine on your magazine in the gun. Keep your extra magazine close and ready to feed whenever you need it. This joiner can be used with Thermold GI metal magazines. Works with 223 and 5.56mm magazines.