Second this. They work well!Go to this page and scroll down. You'll see some photos with targets you can download / print.
D.F.A.T. Dryfire, Focus, Adapter, Training This device allows you to use the rifle and optic to dryfire practice in a very small area. With this adapter most scopes focus in the 11-15 feet...www.dstprecision.net
Hope that helps!