Have a look at ebay, and check the completed auctions also. You might fins a match there. Lone Wolf is one manufacturer who doesn't put many markings on their conversion barrels.

 

I've seen some Glock aftermarket barrels that have no markings at all.
Low end barrels, typically.
What's puzzling is the "NM" which generally means "National Match".
The word "Match" is used in the Glock barrel market, but I've never seen "NM"

 

How is the fit with the slide?
What kind of accuracy do you get with it?
Work with HP rounds?

 

I'll share my experience. Keep in mind this is a sample of one. I had bought a OEM 357 SIG barrel for my G23.4. The barrel came in from a reputable dealer. The barrel was marked very much like any other Glock barrel. There was a serial number. One letter followed by digits. Asked on a forum what gives with the serial number. The snarky answer was it come from a gun with that number. BS. Called the Mother Ship and was told that the drop in barrels not original to the gun did, in fact, have a number. This was not to be confused with a gun serial number. I'd suggest calling Glock for information.

 

...The barrel was marked very much like any other Glock barrel. There was a serial number. One letter followed by digits. ... Called the Mother Ship and was told that the drop in barrels not original to the gun did, in fact, have a number. This was not to be confused with a gun serial number.

A replacement or spare OEM Glock barrel will have a serial of L#####. The L is the first letter of the German word for BARREL (der Lauf).

Glock has sold pistols with barrels that have L serials. Glock sold four TB modelss made in 2014 with threaded barrels. When those sold poorly, Glock replaced in their unsold stock the original threaded barrels with standard barrels that had L serial numbers.

WRT the OP's aftermarket barrel, is it possible that what is reported to be NM is really MM, as in 9 MM? A photo is ALWAYS appropriate with these "identify this" types of postings if the question is posed seriously.

 

I could have done better. It was the letter "L". Incidentally it shoots great.


OT Addendum: Pat Cleburne stopped Billy Sherman here on the north end of Missionary Ridge. That part of the Ridge is called Billy Goat hill. Some military record for an Irish Pharmacist.

 

So I haven't fired it yet. But fitment is excellent. I've taken some pictures compared to my oem 40s&w barrel. Far as I can tell they're spot on identical. Actually this mystery barrel looks better in the lug 'less machining marks' than my oem. Doesn't mean anything, just something I noticed. But it fits my G23 perfectly. Even locks back on a empty 40s&w mag (I don't have any 9mm mags yet). But soon as I do, gonna test it out. I picked up the mystery barrel plus 3 factory 13rd 40s&w mags + a vickers tactical mag release for $100. Could have done worse I suppose............ Here are some pictures to lurk over + at the end, I found a couple other barrels from online classifieds, armslist.....etc. But none of them referenced a maker.

Examples of same barrel for other guns [NOT MINE] but clearly whoever makes these makes for other models too

 

.... I picked up the mystery barrel plus 3 factory 13rd 40s&w mags + a vickers tactical mag release for $100. Could have done worse I suppose............ Here are some pictures to lurk over + at the end, I found a couple other barrels from online classifieds, armslist.....etc. But none of them referenced a maker.

Examples of same barrel for other guns [NOT MINE] but clearly whoever makes these makes for other models too

Uh oh...

 

So it might be junk. It might be good enough for plinking. I didn't do myself any favors by buying a mustang, so all my money has gone into that lately. But I'll pickup at least one 9mm mag next week and take it shooting.

 

Lol why 'uh oh' ?

 

Inside joke...
Mike-M doesn't like that word, let's say.
And he'll be glad to tell you why.

 

I don't know for sure who the maker is, but it looks like an EFK barrrel. The stamping is very similar. EFK barrels I've seen were usually stamped on the side of the barrel chamber and not the barrel hood.

Maybe they we're made for another company by EFK?

You could call EFK or send them a pic. Maybe they can help you out.

 

All this makes me wonder if there is a Glock barrel factory in China. You order the barrel with your company name. Claim to be super precision with no equal on earth.

 

Your guess is as good as mine. But i didn't see any markings for "Super Cowboy USA Hotdog Rocket Ship American Barrel Number One".......... so me thinks it should be ok. At least for standard pressure ammo

 

conversion barrel for a glock 23 and are not all aftermarket barrels touted as match grade or nat match.

 

My advice is to put it in the gun and put a few hundred rounds of different ammo through it. If it's accurate and feeds reliably, then it's a good barrel and it doesn't matter who made it.

I have a KKM 40-9mm conversion barrel for my G23 and I'm very happy with it. But it's clearly marked :"40-9mm" on top and KKM precision on the ejection port side. I also have a stainless Olympic Arms Barrel that's marked 45 ACP NM so the NM (National Match?) stamping on your barrel might indicate that it's an Olympic Arms barrel but that's a long shot.

But as I've said, all that really matters is how well the barrel is actually made and if it shoots straight and feeds reliably.

 

'No longshot:

https://www.thefirearmblog.com/blog/2015/08/17/olympic-arms-offers-glock-pistol-barrels/

 

Wow, nice find. I would have never thought to look at Oly Arms. I mean it may not be the same quality as Lone Wolf, or EFK.....etc. But I've had good luck with Olympic before. At least with their AR uppers. Looks like they don't carry them anymore though. I'll call them Mon morning and find out for sure though. Again, good find man, thx

 

That's what I heard too, barrels g2g. There lowers was what I thought got a bad rap for the cheap castings. They did some forged lowers too which have been just as good as any Colt or Bushmaster of the day. At one point they were contracted by Century for some M16A1 builds (surplus M16 kits with new Oly forged lowers). I got one from 1996, been a rock solid rifle.