Break barrel retention method

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I have never taken a barrel off the breach block but I am a machinist and have an old Gammo break barrel from the 80s . I believe it is a press fit or a shrink fit. Press fit the male and female parts are the same size. Or male part .0005 over female part.Then oil the parts and presses togeather. Shrink fit is when male part is several thousandths over the bore of the female part according to the diameter of the bore size. The larger the bore the more oversized the male part. Then you heat the female part. You can freeze the male part to shrink it. You better have it lined up the way you want it because it will lock to the shaft and is extremely hard or immpossible to get apart without destroying one part or the other. No set screws needed. Hope this helps MM
 
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Thanks for the reply.

I am wanting to convert a Diana 34 clone to 22 cal. and it appears that there is a lack of replacement barrels or it is cost prohibitive to buy a new barrel.

If the barrels are a simple press fit my hopes are to remove the existing .177 barrel and press fit a modified 10/22 barrel.

Could do that or ream the .177 barrel out and put is a 22 caliber barrel liner.
 
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Thanks for the reply.

I am wanting to convert a Diana 34 clone to 22 cal. and it appears that there is a lack of replacement barrels or it is cost prohibitive to buy a new barrel.

If the barrels are a simple press fit my hopes are to remove the existing .177 barrel and press fit a modified 10/22 barrel.

Could do that or ream the .177 barrel out and put is a 22 caliber barrel liner.
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Wow! That's a lot of effort to put into your project. You must have some serious skills and time to put them to use. Best of luck and keep us posted-I myself have fallen into putting $200 worth of shop time into a $50 part!
PS-Have you contacted Mike at Flying Dragon Air Rifles to see if he's got a barrel lying around that you can use? If not, give him a try. 
 
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Just finished removing the barrel from the breech lock.

It is simply pressed in. The main retention mechanism is a flush pin (had to drill it out) about an inch behind the pivot point.

The barrel had two flats milled on top for the rear sight screws as well but I am not too sure if they were intended as points of retention so it would be doubt to add these to the new barrel.

The portion of the barrel that presses into the breech lock is .490" so maybe finding a 22 cal that is 500" (or bit less) could work, I would build some kind tensioned barrel shroud to give the barrel more rigidity.


 
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Just be aware that bore and groove dimensions for a .22 LR are different than for a 5.66 pellet. A .22 short barrel with shallower grooves and a 1/20 twist might work better - or not. Crosman sells their own barrels and also LW barrels for a decent price. Let us know how your makeover works. Fun to experiment anyway.
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Absolutely!

Steering away from the 10/22 barrel as I have a Stevens Favorite Model 1915 that is asking for a new barrel.

Do I need to contact Crosman direct for barrels?
 
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