After over a year Im still wating for him to return my calls about the improperly heat treated firing pins in two cylinders,I purchased,aint holding my breath. Skined that cat a different way,had Happy Trails make up replacement pins. His pins are properly heat treated, he made some extras for stock, I used them in every match from last july on. Two to three matchs a month from july to end of Oct., well its late and math wasnt my best subject. The original pins didnt make it 50 rounds,very deformed on both ends of the pins,very unhappy.I wish Id waited a few months more and went with Kirst,at the time I ordered the R&D cyl. Walt hadnt made any conversion cyl. for the 1860.Just my experinces,yours may vary,Good Luck. Adios Sgt.Jake