How to remove this cocking aid?

[Triggertime]

Yes you’re right, rookie mistake I measured from the front of the breech block (I have an early HW77 and someone gave me some measurements from the same place when I was checking mine).

The 410mm is pretty much the sweet spot on the 80 they are great rifles ive had a fair few over the years

 

[Gym.Hodgson]

Excellent story - it actually had me on the edge of my seat, anticipating the outcome!
Glad it worked out well for you.

 

[Mick_Green]

It’s a HW80K with a shortened barrel.

I’ll try some (lots) of heat today and see if we get any movement.

Thank all.

Since it’s an HW80, the underside / the barrel should be smooth. Chances are someone used something like Araldite to hold it in place. A generous application of heat should break it down enough for you to slide it off. Fingers crossed it comes away without a fight

 

[Averageplinker]

Yay, it came off without too much of a fight

 

[marflow]

barrel weight-damage cover-barrel finisher pick one
it looks like the installer drilled into the barrel beside completely screwing the dovetail up
back to a new barrel finisher
store about drilling barrels
many of the Hammerli 850's in .22 did not shoot well at all and no one could figure out why, they had LW barrels on them
and then the problem was found
the .22 barrel had less meat then the .177 but the hole for the front sight was drilled the same
and in some cases the hole left a dimple inside the barrel, the fix was cut the barrel off