Abstract: A system and method for attaching a stock to and removing a stock from a receiver is readily adaptable for existing weapons such as a rifle. The system includes a mounting device with an extension and latch member. The extension can be mounted on the receiver and the latch member provided on the stock. The extension is inserted into the stock and locked with the latch member by rotation of the stock relative to the receiver. This will mount the stock to the receiver. A plunger insertable into the receiver or stock can be provided to prevent rotation of the stock relative to the receiver after the stock and receiver are mounted together. In the method, the extension is inserted into the latch member, the plunger is retracted and the stock is rotated 90.degree. relative to the plunger. This rotation locks the extension and latch members whereby the stock is mounted to the plunger. Then, upon release of the plunger, further rotation of the stock and receiver is prevented until the plunger is again withdrawn.