Replaces my sights on my 1911 commander with new Trijicon night sights (Mfr Part: CA10). Went out shooting today, fist time with the new sights installed. At 10 yards my grouping is dead centered directly below the bullseye about 5" low. I was able to improve my grouping to about 2" low at my best attempt with a very slow and deliberate aim and sqeeze. Also tried a couple mags out at 25 yards and still low, wider group. Shooting what I think is a Weaver Stance. Its been a while since I've been into shooting, but I've owned the gun for years and with stock sights never had a problem. Looking forward to getting back into regular target shooting and thought I would start out with new night sights, always wanted some on my pistol. I really do not like the idea of going back to old plain factory sights. Any tips tricks are greatly appreciated.