UZI barrel nut to hub thread

[amphibian]

Amphibian,
And other members.....
What is the actual thread pattern on outside of AWC MK9 can?

Bixler 3-lug goes over it.

I should probably know that off the top of my head as I just made the Bixler mount below:

It is 15/16 - 20 TPI
http://theoreticalmachinist.com/Threads_UnifiedImperial.aspx#google_vignette
Mine has a major diameter of .9325 which is within tolerance by the link above. If you need another nut, Joe at Shaw Armament sells them.

 

[mike400]

Not to muddy the waters here, but is there a different way thats already in use? For example, most suppressors today have a proprietary type of FH/MB and that’s how they are mounted to the gun. Why not take a FH/MB and permanently attach to a Uzi barrel nut (or threaded barrel). Then you have a muzzle device and a quick attach point for a suppressor. I have an Octane 9 and I can use direct thread or an Alpha ASR mount. I am sure there are cons to this, but other methods have cons too.

 

[amphibian]

Not to muddy the waters here, but is there a different way thats already in use? For example, most suppressors today have a proprietary type of FH/MB and that’s how they are mounted to the gun. Why not take a FH/MB and permanently attach to a Uzi barrel nut (or threaded barrel). Then you have a muzzle device and a quick attach point for a suppressor. I have an Octane 9 and I can use direct thread or an Alpha ASR mount. I am sure there are cons to this, but other methods have cons too.

Sure you can use an ASR mount or a Griffin EZ lok mount which is gaining popularity.

My personal preference again is the native UZI barrel nut mount designed to be used with a cut down UZI barrel as the most compact setup compared to anything else and I also think the best looking.

I personally like the 3 lug second since I also have an MP5 and have standardized on 3 lug for my 9mm M16 builds as well.
Another reason is 3 lug has been around for what over 30 years now and today there are several quality sources for the adatpers to screw on the barrel and thread the way I have discussed many times to match the full length of the adapter.
My preferred Bixler mount is also more solid and robust than the push / turn 3 lug mounts and also over 30 years old with expired patents and now made by Shaw Armament and now Hansohn Brothers will be making them at the end of the year as well. Not to mention they are not that complicated and I made my own as well.

So this is more of an 'open source' approach and no worries of company X,Y,Z not making the adapters and hopefully more people making the Bixler mounts but if you like the wobbly push / turn mount, there are MANY choices for those w/ no concerns of being locked into a particular vendor.

Contrast that with the amount of sources for XYZ proprietary mounts...many times only 1 source.

 

[JoshNC]

Any further progress on this?

 

[amphibian]

Any further progress on this?

I made the one seen at the bottom of page one of this thread for myself. Not that pretty when you look at my welds but assembled you wouldn't know. Re-posted pics below for convenience.

I did that out of desperation as I saw no commercial offering so I had to make my own. After doing all the work, I just went back to my CT9KS...(which uses Gemtech MK9K mounts). I'll probably use the Bushwhacker on something else.



I also did a SS Alpha thread adapter pictured below.

 

[Captain Bob]

In a different direction.... I have an Avenger suppressor that is Uzi specific. Does anyone know where I can get an adapter to adapt it to 1/2x28 TPI threads to I can use it on other guns?

 

[amphibian]

In a different direction.... I have an Avenger suppressor that is Uzi specific. Does anyone know where I can get an adapter to adapt it to 1/2x28 TPI threads to I can use it on other guns?

I have what is pictured below I'm not using: 1/2-28 to 3/4-10 then goes into a 3/4-10 to UZI thread. I bought these probably over a decade ago to do some testing. Used probably less than 100 rounds. Send me a message if you are interested. This isn't the ad section so not going to post any prices.

 

[dawg180]

I am circling back to this, and if there is still interest I am happy to make up a batch of Uzi HUB mounts (i.e. essentially an UZI barrel nut that has an integral 1.375x24 tpi collar machined into it).

It would work fine with shorter FBI length barrels for sure, and I will check the dimensions/clearance with some of the common suppressors out there- if a 10" barrel sticks too far into the suppressor we can easily make an adapter sleeve with a 1.5" OD that extends the length of the blast chamber and matches the exterior 1.5" O.D. of most all HUB cans, or make some dedicated adapters that extend out further, maybe even a little larger than 1.5" OD to give the old school "two stage" appearance to the suppressor, like the old RPD MAC cans from back in the day.

Let me know what you guys think, happy to take input!

 

[Dirk Hawthorne]

My bowers CAC9 used the UZI barrel nut mount system and I had trouble with it.

A 5 shot group would be 3 shots on paper that you could cover with a quarter, and then two shots that didn't even hit the target paper.

I sent my can and mount to Bowers and they tried it and said it was fine.
I ended up getting a threaded FBI barrel and the threaded mount and now the accuracy is amazing.

The UZI barrel nut system is a natural for the UZI and makes the gun OAL about 1/4" or 3/8" shorter, but nothing would make it work good on my Vector.

The reason I posted this is because Bowers said they run into this problem from time to time, some UZIs don't like this setup.

Of course, the CAC9 is a huge can and the added length may exacerbate any alignment or vibration problem. Who knows?

 

[amphibian]

My bowers CAC9 used the UZI barrel nut mount system and I had trouble with it.

A 5 shot group would be 3 shots on paper that you could cover with a quarter, and then two shots that didn't even hit the target paper.

I sent my can and mount to Bowers and they tried it and said it was fine.
I ended up getting a threaded FBI barrel and the threaded mount and now the accuracy is amazing.

The UZI barrel nut system is a natural for the UZI and makes the gun OAL about 1/4" or 3/8" shorter, but nothing would make it work good on my Vector.

The reason I posted this is because Bowers said they run into this problem from time to time, some UZIs don't like this setup.

Of course, the CAC9 is a huge can and the added length may exacerbate any alignment or vibration problem. Who knows?

Does the Bowers UZI barrel nut mount also align with the OD of the UZI barrel like the Gemtech one does? If not that may be the reason you had issues. I know the Liberty Mystic UZI mount does not and in fact it isn't even a close fit so it dumps a bunch of gas back into the receiver and even into the shooters eyes. My buddy had one and I cut it down and made it a short mount for him and had it use the OD of the barrel as a bearing surface like the old Gemtech ones.

 

[dawg180]

I had the exact same issue with my Bowers can and barrel nut adapter. I was getting kisses on the last baffle which would throw rounds all over the place, made the gun wildly inaccurate.

I built my own can with an integral uzi barrel nut mount and had no issues at all, but I bored out the baffles a little larger than most people would (1/2" hole IIRC)

 

[Dirk Hawthorne]

I had the exact same issue with my Bowers can and barrel nut adapter. I was getting kisses on the last baffle which would throw rounds all over the place, made the gun wildly inaccurate.

I built my own can with an integral uzi barrel nut mount and had no issues at all, but I bored out the baffles a little larger than most people would (1/2" hole IIRC)

I was thinking about boring the baffles on my CAC9 out to see if that would help, since the problem is probably the baffles tipping the bullets a little. I never saw any sign of impacts though. Instead, I bought the KAK threaded FBI barrel and the matching threaded adapter from Bowers and the accuracy is phenomenal now. That is a really really good barrel. It added about 1/4" to the OAL of the gun, but I'm glad that the problem is finally solved.

 

[Dirk Hawthorne]

Does the Bowers UZI barrel nut mount also align with the OD of the UZI barrel like the Gemtech one does? If not that may be the reason you had issues. I know the Liberty Mystic UZI mount does not and in fact it isn't even a close fit so it dumps a bunch of gas back into the receiver and even into the shooters eyes. My buddy had one and I cut it down and made it a short mount for him and had it use the OD of the barrel as a bearing surface like the old Gemtech ones.

The bowers mount does not index off the barrel as far as I could see. It didn't have a huge hole, but it wasn't a tight fit.

It seemed to be a good quality item, and Bowers sent two replacements, so I cannot complain.

It would definitely be a better system if it did tightly align with the barrel, like you described.

My IMI bolt tends to beat up the top of my barrels, maybe the bolt smacking the end of the barrel was causing vibration or something.

The gun is very accurate overall, though, I get really nice groups with it when I support it on a rest.

It would be interesting to see if a barrel nut mount that indexed off the barrel worked good on my gun. It seems like it would, but who knows?

 

[tone602]

I am circling back to this, and if there is still interest I am happy to make up a batch of Uzi HUB mounts (i.e. essentially an UZI barrel nut that has an integral 1.375x24 tpi collar machined into it).

It would work fine with shorter FBI length barrels for sure, and I will check the dimensions/clearance with some of the common suppressors out there- if a 10" barrel sticks too far into the suppressor we can easily make an adapter sleeve with a 1.5" OD that extends the length of the blast chamber and matches the exterior 1.5" O.D. of most all HUB cans, or make some dedicated adapters that extend out further, maybe even a little larger than 1.5" OD to give the old school "two stage" appearance to the suppressor, like the old RPD MAC cans from back in the day.

Let me know what you guys think, happy to take input!

Any progress? Im looking to get one if you're still able to make one.