Tiger Rock AR-15 Featureless Stock Hera CQR Black Small. 5 spacer Allows you to remove the bullet button from your AR15/M4 and go back to the normal magazine release button Weights 2lbs Stock has an 8 slot picatinny rail in the stock for precision shooting. Features 2 QD Ports and 3 sling loops QD not included Package Contents: Tiger Rock AR-15 Featureless Stock Rail Cover What firearm models does the manufacturer say Tiger Rock AR-15 Featureless Stock is compatible with? The manufacturer says that Tiger Rock AR-15 Featureless Stock is compatible with AR-15Tiger Rock ST-GM: AR-15 Featureless Stock Hera CQR Black Small