Looks like it's stamped N with no markings on the bolt?

http://www.ar15.com/archive/topic.html?b=3&f=123&t=369281 - Here's what I found on the N marked carrier.

I've seen FN carriers marked F, FN or F underlined. FN contract carriers with a faint A and  1B1B6 (Toolcraft Inc's CAGE)

All of the FN bolts I've seen were marked MPF with an underline under the M or F.

If it's unmarked it's impossible to determine.

It was on this GB ad
http://www.gunbroker.com/Auction/ViewItem.aspx?Item=252733755
I emailed seller, he looked it up, discovered it was "Global Sales Navy version made by Smith Enterprises

The carrier? Maybe, but every FN carrier I have ever seen has been clearly marked FN..
But the bolt would be marked MPF behind the lugs and have an F under the extractor.

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Forgive my ignorance, but is that good news or bad news. I know that Smith makes good stuff, but which is a better BCG, Smith or FN?

Well I was looking for an FN BCG for my FN A2 build, so bad news I guess

Is it too late for a refund? I hate it when I think that I am buying a "correct" piece (that is inaccurately described) that I have scoured the net for and then I find that it is as good as having nothing at all, for my intended purpose. Sucks....

CLICK

Luckily I asked him about it before I bid.

I thought that you already had it in hand. Nice work.  

N marked carriers were produced by National Aerospace Inc. from the 80’s to mid 90’s. I have seen them with either the N stamped or, marked with white paint later on. They were produced as spare parts for field level repairs. The carrier key having three center punched stake marks per screw in the picture you posted confirm this to me. As, all the N marked carriers I ever encountered NIW were stripped and had to have the keys installed by the repair activity.

Bottom line is while they are indeed .mil spec components and of high quality, they were not produced by FN.

BTW, neither are A marked carriers. Those were produced by Advanced Ordnance Corp who bought the tooling from National Aerospace in 1996.

Wpns Man

Noveske carriers have this N as well, not sure who the maker is for the Noveske carriers though.

The plot thickens

I wasn't sure it was a smith bcg either. The one's I've seen all have been stamped with a shield(Unlike the person it the link above stated)