There's a lot of hoopla out there about slide to frame fit on 1911's, but the truth is that it matters little. The barrel locks up inside the slide, and the sights are on the slide. As 1911Tuner would say, the frame is just a gun mount. The tightest slide to frame fit in the world can't make up for a sloppy barrel and bushing fit.
"Si vis pacem, para bellum" - If you want peace, prepare for war.