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 Post subject: Outer barrel threading
PostPosted: Wed Apr 27, 2022 8:12 am 
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Location: Edmonton
Just wondering if anyone has threaded the outer barrel on a pistol. For attachment of a mock suppressor or if you tried it did it just destroy the barrel. I need to tap it to 12mm cw, I have a tap and die set.
It’s a glock 19 with fixed outer barrel
Just want that cool factor look

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PostPosted: Wed Apr 27, 2022 10:23 am 
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Location: Coalmont BC
Whenever I thread the OD of a barrel, I single-point thread in the lathe, taking shallow cuts, to avoid any possible distortion.... I then clean up the threads with a die or thread chaser nut to final size.... I don't use a die for the entire process, as I am concerned that it might collapse the barrel slightly, adding a "choke" (which could be good or bad).... I have no idea if my concerns are warranted or not....

Bob

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PostPosted: Wed Apr 27, 2022 10:30 am 
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Thank you the insight Bob
I should be more specific about what I wish to do
I want to thread the inner portion of a outer barrel to accept a adapter
Looking at the barrel it seems to have a enough meat to try this
I’m not too concerned if it doesn’t work as i bought this glock and a 1911 as my first air guns
Got both for $50 so if it fails I won’t be crying about it lol

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PostPosted: Wed Apr 27, 2022 10:40 am 
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Location: Kingston, ON
rsterne wrote:
Whenever I thread the OD of a barrel, I single-point thread in the lathe, taking shallow cuts, to avoid any possible distortion.... I then clean up the threads with a die or thread chaser nut to final size.... I don't use a die for the entire process, as I am concerned that it might collapse the barrel slightly, adding a "choke" (which could be good or bad).... I have no idea if my concerns are warranted or not....

Bob

The die is a cutting tool, and the forces are generally circumferential.
Unlikely you would get any load on a die to plasticaly deform the barrel and create a choke; heat and residual stresses may be be a concern, but Bob's technique should avoid that. The main issue with cutting only with a die would be not having the thread concentric with the bore. However for a mock suppressor on a pistol that serves only for cosmetic embellishment, a simple garage die threading with appropriate cutting fluid should be perfectly cromulent. :drinkers:

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PostPosted: Wed Apr 27, 2022 11:46 am 
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I would also be concerned about a die compressing the bore. In a normal barrel, if it happened, this would quite likely be hardly measurable, however I would not use just the die alone
for the same reason(s) Bob suggested. Using a die at all, I would make not more than 1/8 turns, then clear the chips, 1/8th turn then clear.
Old time threading die plates of the iron & case hardening era actually swaged threads onto a rod, with no cutting, so that action might also happen to a small extent when using a die.

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PostPosted: Wed Apr 27, 2022 12:40 pm 
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Location: East Of Hamilton
Quote:
I want to thread the inner portion of a outer barrel to accept a adapter
Do you mean you want to thread the inside of a shroud but not the barrel itself?


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PostPosted: Wed Apr 27, 2022 12:47 pm 
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On the glock 19 gen 3 nbb the outer barrel is fixed so I guess it’s called a shroud the inner barrel moves when fired
I’m have no intentions of threading the inner barrel

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PostPosted: Wed Apr 27, 2022 4:39 pm 
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I'll assume the false barrel is made from potmetal like most replica, and tell you that I personally wouldn't fear doing the job. Potmetal is usually very easy to make threads into, especially with a good quality cutting fluid and good condition tools. I suggest however to be prudent if you're not too familiar with this kind of work: engage the tap into the barrel, turn a full first turn then back-up, then go only half a turn at a time, backing up a quarter turn. Go slowly and take all the time you need, this is no production work lol, you're supposed to have fun :wink: . That would help if you can hold the pistol in a vertical position so you can easily see if the tap is well aligned. HTH.

Good luck and please let us know how it turns out.

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PostPosted: Wed Jun 01, 2022 9:47 am 
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Location: Edmonton
Update the thread adapter I need for this project is finally on the way I could not locate one in North American all sold out so ordered one one from China
Now trying to locate a mock suppressor this is going to be interesting some day I will
Update later on
Cheers

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