Don't know if this will help much. I have a 11 yr old Invader which has had moderate use. I have harvested 2 deer with it. No problems but haven't used it very many seasons either. Extremely accurate! It's rated at 305 fps. If I remember right, the M1 shoots close to 400 fps. I did get complete pass thrus, one with a mechanical broadhead, one with a a fixed blade. I live and have lived in Colorado(but actually bought this crossbow at Gander Mountain in Jackson, TN) for 47 yrs but have only had a CO crossbow permit for about three years. The two deer aforementioned were harvested in W TN. Please let me know what you decide. Ray