Pretty Much all, Mk1,2 &3 Matadors left the factory with an auto safety. It operates from a straight wire rod operating from the under bolt through to the front of the trigger block blade. As soon as it gave problems with auto engaging with the first shot (Quite common) it was easily removed by withdrawing through the stock. Dimensions were @ .060" dia x 1" long. next time you have one in check for a small hole drilled from the rectangular bolt recess to the trigger blade.

Hugh Lomas,
H.G.Lomas Gunmakers Inc.
920 876 3745