much like the chuck on a drill: turning the outer tube one direction threaded it farther onto the barrel, which allowed the multi-petaled inner tube to open; turning the outer tube in the opposite direction forced the petals of the inner tube closer. In this manner, the C-LECT choke could be continuously varied from Cylinder to Full choke. Specs: 3-Shot, Takedown, 20 gauge only (2 3/4-inch), 2 shell detachable magazine. Weight 6 1/4 lbs, barrel, 26" with variable C-Lect-Choke with ventilated barrel. Genuine American Walnut Monte Carlo one piece pistol grip stock with recoil pad. Model 185K: Made in 1950 only. Model 185K-A: Made 1950 to 1955. Model 185K-B: Made 1955 to 1963. Model 185K-C: Changes to trigger and safety lever. Made 1963 to 1964. Model 185K-E: Change to butt plate. Made in 1964 only. External links Mossberg Forum References 185 Bolt-action shotguns