I owned a Springfield Mil-Spec and currently own a Kimber Custom Classic,(seriesI) The mil spec DID have a one peice bbl,(they had just changed to that before I bought mine)However, It did not shoot well,I had to file the front sight down because it was shooting 8" LOW at 15 yds, It also kept cracking grips (went through 2 sets) the factory did replace them, and out of the box it had some nasty razor sharp burrs on the slide,I deburred it myself,The mil spec was at that time, built using frames and slides made in Brazil, and assembled here,in the U.S. I now understand that the entire pistol is now being built in Brazil,The mil Spec did function reliably, just was'nt real accurate, was also fairly tight, and had a decent trigger pull for an out of the box pistol,The Kimber on the other hand was fit up much better, No burrs, excellent trigger pull and much,much, more accurate, mine has adj rear sights but same model can be had with fixed rear sights,Only problems I've had with ammo is when I was fooling around with some of my reloads looking for a light target load,(with both pistols) Both pistols function perfectly with factory ammo and heavier loaded reloads, Kimber gets their slide and frame forgings from Smith & Wessons's foundry, (Les Baer also uses Kimber frames and slides as a base for his pistols)I'm not gonna tell you Kimber is the best thing since sliced bread, But, I do feel Kimbers are better built and more accurate,if possible go look at both side by side, maybe shoot both,see which fits you're hands better,has better trigger pull(to you, anyway) you're going to be the one shooting it so, it should feel comfortable in you're hands, as far as tight tolerances go, Les Baer pistols are some of the tightest out there, very,very, tight, yet, they seem to hold up to dirt /abuse very well,unless you're going into combat where you're going to expose the pistol to mud,sand, dirt etc, I think that's a non-issue, after all, if you're planning on carrying it, you'll take care of it, you should anyway, you're life may depend on it....