Rosso, I think that trigger group is from an MX8 Special. Fred (40up) would know for sure.Still not said what model this antiquated mechanism comes from. But I am informed that carrying spare trigger groups is a must, how much are they. Can't be more than £50. ? I mean look at it. Looks like it dropped out of my Ruger. Oh sh*t it's not that good as the springs never go in the Ruger.??