The Black Dog Machine Magazine Ruger 10/22 22 Long Rifle 50-Round Drum Polyester Smoke. The drum features a modular design with an interchangeable feed tower, allowing it to be configured to function in most AR-15 rimfire conversions, the S&W M&P15-22, or the Ruger 10/22 by installing the appropriate feed tower (10/22 Feed Tower Included, Others Sold Separately). Polycarbonate PC construction withstands heat and wear for durability and long service life. Notes: This Drum Magazine has the Ruger 10/22 Feed Tower installed, and does NOT come with either the AR-15 Rimfire Conversion or S&W M&P15-22 Feed Towers (sold separately).