National Match Bushing

Is it possible to have a national match bushing fit to my Colt GCNM 1911's slide and barrel, without altering the grooves in the slide?

That way, if I so desired, I could put the original bushing back in to make it stock, as in original again.

Yes

What would be a fair price to have this done?

"If you have to ask the price......" 

The reality is the price for the work is less than shipping to and from a gunsmith so find a qualified local gunsmith and just get it done. It should not be more than an hour or so of the shop labor rate plus the part. Either that or ship it off to someone and get a bunch of work done at one time, then the price for the shipping is absorbed easier.

If you provide the measurements, EGW will make you a bushing. Around forty bucks if I remember right.

Thanks guys.

I did this myself to my GCNM after watching some videos.  Was easy and turned out well.  Syre helped the groups.  Don

JKR wrote:If you provide the measurements, EGW will make you a bushing. Around forty bucks if I remember right.

Good choice.  Reduced my RO9 groups significantly.  Closer to $30 including shipping in 2015.  They are very helpful.

I went a different route to the same path. I really like the Briley bushing. They come in drop in or oversized that need a tiny bit of fitting. I now have a selection of different sized inserts and can match a bushing to a barrel. That's important to me since a lot of my 1911's are dual or even 3 caliber.  NFI

http://www.midwayusa.com/product/459940/briley-oversized-spherical-barrel-bushing-with-580-ring-1911-government-stainless-steel

I went with EGW after reading their bushing info about three times. I was lucky as I called near the end of the month when they mill their recent orders, so I got mine within a week (I went with the slanted bore cut and measured several times to make sure I had done it properly). I used 600x emery paper and a wooden dowel for fitting, which only took about an hour. I got the bushing for a Ed Brown Kobra Carry, which shot about 2-in groups with good hand loads at 25 yds (DISAPPOINTED), but it now shoots nearly one hole groups at same distance (using 160gr. Barnes TAC-XP MANN load) with the EGW bushing.

Yes, I realize that a defense oriented 1911 isn't supposed to be match accurate, but I firmly believe if you save your money for a pricey pistol, the whole thing should be hand fitted and accurate. I've been spoiled by my Rock River (the first production makers I know of to offer 1.5" 50-yd guarantee), but of course, custom pistol smiths have been making accurate 1911s for years. Makers that offer 15-yard test targets aren't providing clients any meaningful information about their products, IMHO.

Inaccurate guns are simply not interesting. dipnet

After talking it over with a gunsmith, I changed my plans for this gun.

It will be fitted with a Kart barrel, NM bushing, and the slide tightened and fit to the frame.

It just makes sense.

Warhorse,
Good decisions. In the case I mentioned, the slide and frame fit were excellent. I just think EB dropped the ball a little with respect to barrel/bushing fitting. I'm nothing more than an amateur; anything advanced requires a gunsmith. There are many good ones on this site. Good luck, dipnet