Carlson's Long Beard 20 Gauge Beretta/Benelli Mobil Turkey Choke Tube. This choke tube has been specially designed to produce tight patterns when shooting Winchester's Long Beard Turkey loads. This ammunition features Shot-Lok Technology that allows for tight patterns and long downrange reach. Pair this ammunition's capabilities with the new Carlson's Long Beard Turkey Choke and you have a devastating, gobbler-killing combination. No steel shot larger the #4 may be used in our Turkey Choke Tubes. Carlson's choke tubes are backed by a lifetime warranty, and made in the USA.