Bi-pod attaches a front-end sling swivel available on most standard hunting rifles. Remove sling attachment and attach bi-pod to the stock's pin. Some modern American Rifle stocks require attachments to the rifle's floating stock (key-mod, m-lok, p-rail, etc.). These attachments range in cost from $10 - $30 from various after market vendors. The brochure with the bi-pod will explain details for a variety of rifle types.