Nambu troubleshooting...
 

John, you're excused. :evilgrin:

My Nambu is a jam-O-matic, stovepipe special. For those familiar, here is a picture of the ramp/chamber mouth area - is that a chip at the bottom of the chamber mouth? Or is it supposed to look like that?

http://www.doubleveil.net/share/Nambuchamber2.jpg

Overall image for viewer orientation:

http://www.doubleveil.net/share/Nambuchamber1.jpg

All springs have been replaced, including in both mags (by G.T.).

I'm flying blind here so bear with me.
If it is stovepiping the fired case, might that suggest that the recoil is insufficient to bump the rim hard enough to eject it? Does it feed correctly using live ammo. (or dummies) and cycling the bolt by hand? Also is the ammo. of sufficient velocity go work the system? I understand that there aren't many choices of ammo out there.
Is the ejector long enough to hit the rim early enough?
Have you reverted back to the original mainspring? I'm also wondering if the replacement spring isn't too stiff.
Maybe give us a few more details on what it is, and is not, doing.
dju

There's no feed ramp on my Nambu, just a slight bevel at the 6o'clock position. Yours is much larger. Maybe someone Dremeled yours out, or they changed that profile over the years (mine's a 1937). I've shot mine with Mr.Nambu loads and some ammo remanufactured from .40 S&W brass and it functions fine with the original springs. I'd kinda doubt that making that bevel larger would cause your problems though.

Ok, random factoids.

Mine's a '43. The only ammo I've used in it has been the "Mr. Nambu" loads, which is good ammo by all accounts. I fired about 20 rds, with 4 or 5 stovepipes. Manually cycling with snap caps is even worse - predictably enough. I'll take another squint at the extractor - however, I noticed today when playing with the gun and snap caps, that it wedged and stovepiped on the FIRST round - nothing in the chamber to start with. It did this at least twice.

How would I know if the *ejector* was right or wrong?

A "stovepipe" jam is usually referring to a FIRED case that isn't fully ejected and is caught between the bolt face and the chamber mouth facing up....hence a stove "pipe". What you're describing is a failure to feed and chamber. I'd suspect the feed lips on your magazine are sprung too wide allowing the round to sit too high to enter the chamber straight on.

if you haven't already found this site, google Nambu World, Teri Shaw's site......she has extensive connections and a wealth of knowledge.....I also have nambu interests and enjoy talking to her.....tom

Yea, its doing both - but your feed lip suggestion sounds like gold - the round does indeed look very high at the top! I'll try some "monkeying"!

An familiar with her site - I just wish it had a forum! Never thought to contact her directly though...

You guys here are great - if push comes to shove I'll take it to a 'smith, but Nukem's feed lip idea resonates with what I'd observed just today, and will try that first. I was wondering why the top round (snap cap) was so far up...

Maybe try to beg/borrow/steal a loaner magazine to see it it works before you start bending? I'd loan you one but have no access to the Nambu's for a few weeks.
dju

Next best thing, I have 2 mags. To be honest, yesterday's test was only with one of them. If I don't get anywhere, I'll take the whole mess to a gunsmith - we have an old timer here who shouldn't have too much problem with it...

:confused: Excused? :eek:

:roflmao::roflmao::roflmao:


...and I was going to suggest that your first step in curing the problem was to not load the Nambu! :evilgrin: :D

Seeing as I know your love for all things Nambu, I figured you'd rather stay outta the room! After all, it might go off! :cheers: Still, since you're here; how about a Nambu patch! :jumper::rockon::thumbsup::eek:

It is amazing that you have to have a C&R or FFL to mail these "guns" to each other... Don't they have to WORK in order to be considered a firearm? :D

Would that be a Nambu with a band-aid on it? :evilgrin:

Whaddaya mean? My Nambu works just fine! Those papers on my desk aren't going anywhere! :eek:
FUN-NY GUY!

Anybody gotsa couple of pix of the top of a working nambu mag - with and without loaded rounds? It would be very helpful for comparisons...

Here's a couple quick ones.....Oh and we need to try to get John to quit hatin' on the Nambu! Somebody write a post about a Glisenti !

Ed Tinker seems to have intimate knowledge of the Glisenti...I'd be interested in reading his in-depth review of this iconic WW II handgun... :thumbup:

Thanx for the pix, Nuke! That should be enough to get me started!

As for John's non-love of the Nambu, it doesn't take a degree in psychology to figure that one out... :jumper::evilgrin::D

okay, enough fun... :D

Here is a serious suggestion. Look into the Airsoft line of Nambu's as the photos appear that the magazines may be able to be modified to handle real ammo... At least the body shown in the example photo looks pretty close to the real thing... it would be a real "project"... but it could work. (ignore the title of the link... it really does show an airsoft nambu mag)

http://www.airsoftatlanta.com/Maruze...ck-p/67054.htm

Isn't *that* something!