Another PH Dragon thread

[tinbum]

Git to shoot my new to me Dragon today. It shot a lovely little group at 25 yards. Three feet to the right of the POA!

A closer look shows the barrel is canted to the right, possibly by the front block on which the barrel leans heavily on the left hand side. These holes are original to the guns manufacture, but with the front block removed it is clear that the barrel wants to be well to the left of the centre.

I can probably fix by enlarging the blocks fixing holes so it can be fitted where I want the "top" to be, but I am concerned that in 24 years the problem hasn't been apparent to its original owner.

Opinions?

[T 20]

Hi Nick

Try putting a straight edge along the left hand side of the pump tube opposite the pump arm --- the pump tubes can bend.



All the best Mick

[tinbum]

Hi Nick

Try putting a straight edge along the left hand side of the pump tube opposite the pump arm --- the pump tubes can bend.



All the best Mick

Well F%# me! You're only right!

What the bleedin flip can I do about that?

[T 20]

Well F%# me! You're only right!

What the bleedin flip can I do about that?

Completely strip the gun then find two lengths of bright round bar that are an exact fit in the pump tube.

Mount one bar in a vice and slide the tube on until it reaches the cocking arm slot, then slide the other bar into the other end of the tube and pull like buggery in the appropriate direction.




All the best Mick

[tinbum]

Completely strip the gun then find two lengths of bright round bar that are an exact fit in the pump tube.

Mount one bar in a vice and slide the tube on until it reaches the cocking arm slot, then slide the other bar into the other end of the tube and pull like buggery in the appropriate direction.




All the best Mick

Bugger! I've stripped it down pretty far, but not right to empty yet. I'll get the bar and then strip and do the fix with a camera crew present.

[Jimny4x4]

From somewhere I read that the front block uses an O ring or rings to sort of free float the barrel and centre it .

[tinbum]

From somewhere I read that the front block uses an O ring or rings to sort of free float the barrel and centre it .

Yes, but because the pump tube is bent the barrel doesn't line up with the block

[averageplinker]

How the flipping eck do they get their pump tubes bent????

[Rickenbacker]

I have a similar problem I discovered with a Daystate PCP.

Damaged by being stood on, or kneeled on, in a box or guncase perhaps?

[...] I am concerned that in 24 years the problem hasn't been apparent to its original owner.

Opinions?

Could it have gotten bent in the post Nick?

[T 20]

Bugger! I've stripped it down pretty far, but not right to empty yet. I'll get the bar and then strip and do the fix with a camera crew present.

If you know someone with some Delrin, Nick ?

You could put three machined Delrin slugs in the tube and then press adjacent to the middle one to straighten the tube.



All the best Mick

[T 20]

From somewhere I read that the front block uses an O ring or rings to sort of free float the barrel and centre it .

Not on the Dragon I have, but the Mohawk uses an O ring in the front barrel mount.





All the best Mick

[T 20]

How the flipping eck do they get their pump tubes bent????

Imagine the pump tube and pump arm as a capital A


When you push the feet together to compress the centre bar (air), the sides of the "A" are trying to bend round the centre bar.

If the pump arm is stronger than the pump tube, then over time the tube will bend towards the pump arm during pumping.



All the best Mick

[tinbum]

I have a similar problem I discovered with a Daystate PCP.

Damaged by being stood on, or kneeled on, in a box or guncase perhaps?

Could it have gotten bent in the post Nick?

No, packaging was perfect. Many years of onanism can build up the arm muscles to almost superhuman strength, but to bend a PCP by the cocking bolt? You must have a right arm like Popeye!

[Jimny4x4]

Not on the Dragon I have, but the Mohawk uses an O ring in the front barrel mount.





All the best Mick

For .22 Sporters , the old schematic online shows a machined O ring recess to the barrel a few cm's back from the muzzle - where it is inserted / covered in that lumpy front block , with an O used to free float ( my words , maybe not the designers intention ) , with a specific part No .47 for this barrel O ring .

Did see that there was once online a mention of this being only for the Sporter .
What they did for the Target version , fraid no idea .

[T 20]

For .22 Sporters , the old schematic online shows a machined O ring recess to the barrel a few cm's back from the muzzle - where it is inserted / covered in that lumpy front block , with an O used to free float ( my words , maybe not the designers intention ) , with a specific part No .47 for this barrel O ring .

Did see that there was once online a mention of this being only for the Sporter .
What they did for the Target version , fraid no idea .

Apologies, you are correct, there is indeed a recess in the reduced section of the barrel containing an O ring.

Like a numpty I only looked inside the front barrel mounting block for an O ring recess as used on the Mohawk.





All the best Mick