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A lot of debate has gone around on the internet about what the ' NM' serial number prefix stands for. Some believe that it stands for 'National Match', which is typically the case when you see that marking, however it's not so with Springfield 1911's.

It is well known that Springfield Armory Inc. 1911's start from IMBEL forgings from Brazil. The 1911's that have the 'Brazil' import marking's on the frame have more than 50% of the work performed by IMBEL, these would have the ' N' prefix. The GI's are also made in Brazil and have the WW prefix. The Mil-spec model's can have either a N or NM prefix, with the N being more common.

Springfield's Loaded models, could either have the N or NM prefix. Model's with the N prefix are imported almost complete with the exception of the sight and beavertail grip safety cut's. These cuts are done at Springfield's facility in Geneseo, IL. Belajar Program Excel 2010. The NM prefix Loaded's (as well as the Range Officer, TRP and Trophy Match) have the magwell and most of the internal cuts done, but no rail cuts. The final CNC machining on NM prefixes is done in Illinois. This information was from this.

The rest of the 1911 prefixes such as LW, TGO-2, TGO-3 and EMP all come from Springfield's Illinois facility, though I have seen some older LW's marked 'Brazil'. The Custom Shop gun prefixes such as CRG, FBI, DEA, and TGO-1, as well as any other Custom Shop marked gun, are also made in Illinois.

According to Springfield, the Custom Shop marked guns are built using 'National Match' frames. SA N vs SA NM guns While at a LGS today, I saw that they had a SA Mil-Spec parkerized. And then saw it was a NM marked gun.

So I had to check it out. Damn was this thing nicely put together. The frame and slide was tight and rolled on bearings. Barrel locked up was really nice, and it took some effort to break it out of battery.

This is also true for Quack's SA Mil-Spec NM gun. Having own a SA Mil-Spec SS, and it's a N marked gun, it's completely night and day between the two guns. After a trip back to SA, and a barrel replacement (under warranty) my MS has the same lock up tightness as the NM marked gun.

However, my MS slide is still looser and not as nicely machined as the NM ones. From my experience. In general the NM#'s have a better fit and the machining is cleaner. There are exceptions as my longslide (N#) had a very good fit and outward finish. The internal machining showed more machine marks and the ramp was a little rough. My first encounter was when shopping for my first 5' SA. The stainless loaded's I saw were rough and loose while the loaded target's were much better.

A lot of it was just the difference between pistol 'a' and pistol 'b'. Shopping and looking over several can have advantages. I have two N Mil-Specs and one NM Mil-Spec. I have found that the NM is definately tighter in the slide to frame fit, but also in some other areas that I don't care for. The thumb safety is difficult to remove compared to the N guns.