Building a .17 Mach 2 Cooey 39

cyclone

cyclone

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I've asked in the Rimfire forums, but it may be more appropriate here: past relining the bore and reaming the chamber, what else need to be done to convert my Cooey 39 to .17 M2? :confused:

Purists, chill: the barrel has been so shot-out it's approaching smoothbore territory :redface:. This way the rifle lives again as a shooter, ok? :cool:
 
why not get an hm2 barrel, machine it so that it fits the cooey 39 breech and the ejector lines up? i dont know much about gunsmithing so i dont know if this would be safe
 
Apart from sleeving the bore and reaming a chamber, probably nothing.
But why use a Cooey 39? For the amount of work and expense, why not use a little more upscale rifle for the project?
 
Kind of a lowly rifle to build a .17 Mach 2 on, never meant for a scope, hard to operate bolt ... but you are correct - it just needs a liner and a reamer.

I have a couple of liners in stock and a .17 Mach 2 reamer on the way. I am doing a 77-22 for myself to try.
 
guntech said:
Kind of a lowly rifle to build a .17 Mach 2 on, never meant for a scope, hard to operate bolt ... but you are correct - it just needs a liner and a reamer.

I have a couple of liners in stock and a .17 Mach 2 reamer on the way. I am doing a 77-22 for myself to try.
Click to expand...

Just a quick question...what does the reamer do? I'm freely admitting I'm a novice here.
 
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I rebarreled a Ruger 10/22 to .17 HM2. It works great, but the ammo is far more scarce, expensive and loud. I would prefer the .22 for load flexibility, cost, availability and shooter comfort from noise.
I have relined a few shot out .22s with .22 barrel liners and then reamed the chamber. The .17 would be the same job, easy enough to do and works well.
In this case though, I am not sure of the value of the conversion. Just for learning and to have one of very few .17 HM2 M39s though would add something to it.
 
cyclone said:
Just asking..what is the effect of an unreamed chamber? Not that I'd do that, but where else could I even ask this...;)
Click to expand...

Reaming creates the chamber by cutting the barrel to fit the cartridge. No reaming means you can't seat the cartridge in the barrel.
If you are asking this you should be doing a bit more research before you start.
Also it can be an absolute bear to remove a cooey barrel from the action so you can work on it.
 
cyclone said:
Just asking..what is the effect of an unreamed chamber? Not that I'd do that, but where else could I even ask this...;)
Click to expand...

If the barrel has not been chambered, it has no chamber... that is what the reamer is for...

as the above post said... it sounds like this is not something for you to do...
 
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