Benjamin, included is a "Modified Choke Tube". This is an excellent starter shotgun. Great unbiased review with shooting results here (Click the 1st link) : google.com/search?source=hp&ei=nBtkXL6wHpGp5wLD5734AQ&q=Savage+Stevens+301+Compact+Single+Shot+Shotgun+410+choke+tube&btnK=Google+Search&oq=Savage+Stevens+301+Compact+Single+Shot+Shotgun+410+choke+tube&gs_l=psy-ab.3...1881.7789..9080...0.0..0.165.1108.10j2......0....2j1..gws-wiz.....0..0j0i22i30j33i299j33i160.cgmx7QXURxA

please check this with Stevens as I think it is a fixed modified choke not a screw in tube Monday through Friday 8:00AM – 5:00PM EST
Phone
US: (413) 568-7001 or (800) 370-0708

Benjamin, this shotgun has a modified choke.
"FEATURES:
-Caliber: .410 GA
-22" Carbon Steel Barrel
-3" Chamber size
-Modified choke
-Black Matte synthetic stock
-Overall length: 45.25"