I have a stainless 5" Springfield 1911-A1 in 9mm. I very much would like to have a 4" "commander" style gun in this caliber. Is it possible to cut the slide down by 1" and fit a bull barrel in 9mm or should I sell the gun and use the money to get a STI Ranger II? I like the 9mm platform but Springfield's adjustable sights suck. the hinge pin on them keeps walking out. I did not want the adjustable sight model but it was the only one available at the store and the wait is over 9 months for a new one. Please advise.