Our stock adapter and folding adapter for the Cobray Semi auto makes it easy to mount this two bolt style rear skeleton stock to the rear of your receiver. The adapter includes a custom designed inner rear spring spacer that replaces the OEM part. This allows the bracket to be bolted to the gun and improve strength. Installs easily with an Allen wrench (provided) and a button head bolt. This skeleton stock is lightweight and offers a rear rubber butt pad, and can be set up to fold right or left. Installation instructions included.