At the end of part one I had some test shots with the HW80 and I was a bit disappointed. Harsh and twangy were my impressions. Today I got my chrono back so I thought I would do a quick power test to see where I was at.
A 5 shot string averaged 702 fps with Daystate Sovereign pellets. Not a bad starting point for a .177. However this gun is a .22….
That means the 15.9 grain pellets were coming out just shy of 17.5 ft-lb of muzzle energy. This is the second HW80 I have bought second hand that has been well over the UK limit, and highlights the importance of checking the power of any airgun you buy.
So it went up on the bench for stripping straight away. The procedure for these is very easy:
- Remove the 4 stock screws. Two at the forend, and two on the trigger guard
- Remove the barrel and breech block. This isn’t necessary but I find it makes the trigger block easier to remove.
- There is just the breech pin holding the block to the main cylinder. I usually break the barrel first to remove the tension from the detent. Or you can keep the barrel locked, and push down on the end (as if you were pushing it back into the action) with the same effect.
- There should be two thin washers on the breech block, and two split washers on the pin, as shown:
- Once the cocking lever is removed, the cocking linkage can be wiggled out of its slot.
- Then the trigger block can be unscrewed (lefty loosey). A spring compressor is recommended when doing this on any gun. Unless you have stripped the gun before, you don’t know how much pre-load there will be, and therefore how far the trigger block will fly.
- With the trigger block off, the guide, spring and piston will slide out
Unfortunately there isn’t any Venom magic inside this gun. I was hoping for a spring guide threaded into the trigger block and a piston running on bearings. Instead there is just some standard parts, a terrible Ox spring, and a ton of moly grease. This is a very disappointing but sometimes that’s how the second hand market is.
I had decided that if it was a genuine Venom gun I was going to restore and sell it on to someone to add to their collection. However I can’t advertise this as a Venom gun with those standard internals!
I think the new plan is to keep it. I can’t get over how nice that Tyrolean stock feels when shouldered. I’m thinking of putting a simple drop in tuning kit consisting of a standard spring matched to properly fitting guides, then a period 4×32 hunting scope and a new sling. The next update will be a few weeks away while I wait for parts to arrive.
The standard piston and seal clean up OK, so I will keep those in for now.
In the meantime I have found a simple 3 step process to fix the Ox spring:
- Burn it with fire
- Cut it in half
- Throw it in the pit