The M66 was all the rage with LE when it appeared in the early 70's. The cops were eager to get a M19 that needed no maintenance. Most LE 66's were shot very little, and then with 38's. My first m66 was $123, complete with all SS sights in 1974. Later when departments went to shooting magnums for training, did problems arise. The K magnums were simply not up to a constant diet of 357 magnums, especially the 125 gr loads, hence the introduction of the L frame guns in the early 80's. Every M66 I've shot was a terrific shooter, particularly the 3" guns and I carried a M66 6" on the road as a duty gun for years. If you can find one in mint condition, snap it up. You'll find the 617 makes a perfect understeady for it. Bob!!