I have a Model 66, no dash, P&R that I bought new in 1978 which has a 6 1/8" barrel. I've read that only a few early "6 in." had that length and all subsequent had a 5 7/8" barrel. Anyone have any idea on the rarity of mine. It definately has a special look to it compared to most 6" barrelled ones. Hard to believe that 1/4" can change the looks so much.