cocker threads?

I've got a barrel that I was on the understanding was cocker threads. But it does not match the Rex M2 barrel that I have also. Can anyone help me confirm this as old cocker threading? Or something else? If its something else. How do I identify it?

Blue insert is the Rex. Pink insert is the one in question.

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Originally Posted by blackdeath1k

I've got a barrel that I was on the understanding was cocker threads. But it does not match the Rex M2 barrel that I have also. Can anyone help me confirm this as old cocker threading? Or something else? If its something else. How do I identify it?

Blue insert is the Rex. Pink insert is the one in question.

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the one on the right is cocker threading obviously, the one on the left actually looks like bushmaster threading to me. if you screw it in cocker thread it will go like 1-1 1/2 turn then stop threading correct?

i was thinking ion threads but i went and checked and no

I'm thinking shocker threads

http://www.docsmachine.com/tech/barrelguide.html

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Originally Posted by Chronobreak

the one on the right is cocker threading obviously, the one on the left actually looks like bushmaster threading to me. if you screw it in cocker thread it will go like 1-1 1/2 turn then stop threading correct?

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In the M2 yes. It threads in a turn or 2 and stops. I can actually get all specs tomorrow. Including tooth per inch. If that will help. I'm kinda hung here with a useless barrel.

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Originally Posted by Chronobreak

the one on the right is cocker threading obviously, the one on the left actually looks like bushmaster threading to me. if you screw it in cocker thread it will go like 1-1 1/2 turn then stop threading correct?

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B2K threads are a 4 point lead and generally have an oring groove in them.

i would guess either Impulse or Spyder. leaning more towards the spyder, the threads look metric.

It is not spyder. Shaft is a larger od than spyder.

Here are all the dimensions. Note the standard 16T gauge fit. But depth was wrong. The metric 1.5T fit perfect.

Looks like Angel threads.

Twistlock all the way!!!

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Originally Posted by Ando

Twistlock all the way!!!

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Although I agree with this 100%. Which is why all my mags are twist lock. That doesn't help me identify this mystery thread freak back. And I can't really sell something that I am not sure what it is.

well, time to go comparing with Doc's barrel ID guide

surprised that no one had thought of it before...

Looks like Impulse/Ion threads to me. Oddly enough one of the few not on Docs list.

that list is showing its age.