Receiver threads cooked

[Gold1927a1]

I need serious help here...

When installing the barrel into my kahr the barrel doesn't want to spin in straight.. the threads are screwed..

I'll admit that when spinning on the first thread or two the barrel didn't have enough grip and with the leverage and heavy tools it just ripped the barrel straight out the receiver...

Is there a tap I can use to correct this? 

I'm already a ton of money in on this, gun is on a form 1 and bought Conner's removal tool (which broke the heavily red loctite barrel loose with ease leaving no marks).

 

Edited April 20, 2025 by Gold1927a1

[Gold1927a1]

[deerslayer]

Receiver threads can be undersize to some barrels fit.  If there is still receiver threads left, I would clean out the bad stuff, make the barrel threads major and minor a little undersize and screw it back in.  

[Gold1927a1]

1 minute ago, deerslayer said:

Receiver threads can be undersize to some barrels fit.  If there is still receiver threads left, I would clean out the bad stuff, make the barrel threads major and minor a little undersize and screw it back in.  

clarification please. What tool would this require? Or take to machine shop? Or just send to you?

[deerslayer]

Remaining threads in barrel look good for what I described above.  There isn't the pressure in this barrel like in a bolt action Hi power rifle.  You will be fine.

[Gold1927a1]

Comparing old and new barrel threads they seem to be identical. I'm wondering if since the threads are so thick toward the end and there seem to be plenty left inside the receiver if I can just continue on and the larger threads will correct the barrel as it is tightened? Never to be removed ever again..

[deerslayer]

Email me danblockstocks@gmail.com 

[deerslayer]

Or call 641-390-0878 

[Gold1927a1]

Well I sent the gun off to Dan and he fixed the issue. He also reamed the chamber to smg spec and the stock shortened by an inch. 

Thanks again, Dan!

 

 

[BillyDixon]

is that an after market barrel ? possibly the barrel threads are over size dia. , with a mike  measur threads , compair to factory spec, contact the barrel manf. if after market barrel and get replacement , my opinon, just sayn

[Gold1927a1]

It is a Kahr barrel. The gun is a Kahr. 

[BillyDixon]

friends dont let friends buy kahr, just sayn

[Gold1927a1]

It's the only obtainable Thompson for most of us.

To be fair I haven't had a single malfunction with the gun in over 500 rounds and I don't think Kahr really expects too many barrels to be swapped when considering the service life of a .45 barrel. Just took it out and it ran like a top.

[Bridgeport28A1]

On 4/20/2025 at 3:59 PM, Gold1927a1 said:

What was the grey goop at the end of the receiver threads?

[deerslayer]

I had to chase the major and the minor threads on a non gi barrel today to go in a gi m1 full auto.  

[Bridgeport28A1]

On 4/20/2025 at 3:59 PM, Gold1927a1 said:

Deerslayer, what was the gray looking goop inside the receiver nose visible in the third photograph?

[deerslayer]

I don't know what it was.   Powder residue?

[Countryboy77]

On 6/11/2025 at 2:18 PM, Bridgeport28A1 said:

What was the grey goop at the end of the receiver threads?

Hell with the grey residue, Kahr doesn Broach the area where the Extractor rides!? Looks ike they just dremel clearance.Jeez.

Edited June 27, 2025 by Countryboy77

[deerslayer]

They use a rotory tool instead of a broach.   For a while they made a very undersize cut the required extractors with the corners ground off.   The cut is bigger now.  But their extractors are now poorly made and fitted.

[Gold1927a1]

On 6/18/2025 at 3:39 PM, Bridgeport28A1 said:

what was the gray looking goop

Just powder residue. Didn't clean the gun.