It is my understanding that the 16 and 20 gauge were  made in the Model 12 up to the end of production in 1963.The late Model 12 12 gauge guns from, guessing about 1958 until end of production in 1963, had an extended slide handle.Did the 16 and 20 gauge guns made in this time period,  have the extended slide handle as well?I know the 16 and 20 gauge were made on a different  size frames,from the 12 gauge..