The B-2000 semi auto was made from 1974 to 1980 . The main difference in the trap models was basically just the middle bead and a trap stock with better wood. The 2000 did not gain popularity and only had a 6 year run. The design was copied off of the Browning "Double Auto" with a loading gate on the left side of the receiver. . The main difference being that the Double Auto only held 2 shells. They were sort of an odd duck ,and I only saw a limited few on the trap line. If you saw somebody shooting one in dim light it was a hoot to see fire come out of 3 different places --The barrel, ejection port, and the hole for the loading gate on the left side of the receiver !