Carlson's 12 Gauge Black Cloud Choke Tube for Mossberg 835 and 935, Long Range The Extended tube is constructed of a Titanium-coated steel, and comes in Mid Range and Long Range models. The titanium coating helps the uniquely designed FliteControl Wad in Black Cloud perform downrange with less build-up in the choke and allows the Flitestopper shot to do its job this increasing your take in the field These chokes are specifically designed to get the most performance from Federal's new Black Cloud, but perform extremely well with other manufactures as well. The Long Range choke tube should not be used with any steel shot larger than BB or with any steel shot faster than 1550 fps This choke is backed by Carlson's lifetime warranty.