I have very very limited experiences with revolvers. I had a bad experience and we all discussed this over on my thread in the revolver section. In the exploded parts diagram of a ruger gp100 I see 71 total parts. Compared to about 49 for both of my auto pistols. Reliability will depend on quality of materials and execution of manufacturing, and also how the machine is maintained and the amount of rds fired through it, and how hot those rounds are. Leading cause of failures in autos would be magazine and ammo problems. Which revolvers do not have magazines nor do they "feed" ammo