I shot this revolver a few months ago and have been trying to figure out what it is. I shot .38 Special through it so it might be a .357. I thought it was maybe a Ruger GP100 but it doesn't have a full underlug and I believe it is a 4" and don't all 4" GP100s have a full underlug in which case this isn't a GP100. It does have the same push-button cylinder release as the Ruger GP100. The sights are fixed I believe. Please let me know if you recognize this revolver.