Air Venturi Avenge x .177 suddenly shoots innacurately

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Maxgasmekl said:
How do I remove the shroud? It should be easy just to turn it by hand but mine is very tight
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Make sure the barrel is seated and the set screws are installed and snug. I set mine to 15in/lbs. Grab a bunch of rubber bands and wrap them around the shroud. This should give you the grip needed to get the shroud off. Mine was also on super-duper tight. It does need to be turned counter-clockwise or lefty-loosey in case you're afraid when a lot of force is required.
 
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drpietrzak said:
A couple of question from me.

Are you shooting the same tin of pellets?
Is the rifle set to the same setting each time (High/Low, regulator pressure and tank pressure)
Any changes in the hammer spring?
Have you checked to barrel mounting screws (you have to take the scope off)?
Have you bumped the barrel at all?
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Yes only crossmans - changed to HN Barracuda to see if that would make any difference. Sometimes it groups and then suddenly it doesnt. Slugs were awefull. Havent changed anything on the gun. If the barrelmounting screws are the two set screws on top of the gun I tightened them down. Didnt make it better. I havent bumped the barrel. I have to buy me a chronograph to see if its acts funny
 
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droyd said:
Make sure the barrel is seated and the set screws are installed and snug. I set mine to 15in/lbs. Grab a bunch of rubber bands and wrap them around the shroud. This should give you the grip needed to get the shroud off. Mine was also on super-duper tight. It does need to be turned counter-clockwise or lefty-loosey in case you're afraid when a lot of force is required.
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Thanks. It does seem like the plastic part in the shroud sits in the right place. When I look down the barrel with the muffler off
 
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I have two different inexpensive chinese made chronographs. I bought a barrel mount one first and they are still available from Aliexpress for less than $20 or from Amazon for about $30. Mine works fine but it shifts my point of impact and I like to shoot groups while getting velocity readings. So I bought a tripod mount that works on infared light like the barrel clamping one but sits by itself unattached to the gun. I got it from Aliexpress and it was harder to find. I'd post a link but I cannot do them from a track pad like I use on this laptop. But a google search like "cheap chinese chronograph for airguns" should find at least the barrel clamp one.
 
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JimD said:
I have two different inexpensive chinese made chronographs. I bought a barrel mount one first and they are still available from Aliexpress for less than $20 or from Amazon for about $30. Mine works fine but it shifts my point of impact and I like to shoot groups while getting velocity readings. So I bought a tripod mount that works on infared light like the barrel clamping one but sits by itself unattached to the gun. I got it from Aliexpress and it was harder to find. I'd post a link but I cannot do them from a track pad like I use on this laptop. But a google search like "cheap chinese chronograph for airguns" should find at least the barrel clamp one.
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Like this one?

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Just remembered
How do fill the rifle? do you have sufficient filter system that caches the humidity.

Many shooters with the cheap chinese compressors just filling the rifles directly from the compressor or through the not sufficient filter that is supplied with the compressor. Unfortunately that can be a big mistake causing corrosion inside your rifle.

And be aware just from my memory:
You need to unscrew one or two small pin-bolts closest to the rifle body, before you can easily pull away the shroud.
Not twisting it hard !!!!!

Best regards
Claus
 
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droyd said:
I also own an avenge-x and had this same issue with my .22. It was accurate and then after a thousand or so shots the groups widened and were moving everywhere. Here's what fixed it for me:

Try depressurizing and take out the regulator. Be sure to take a pic of the regulator's washers and note down the orientation of them. Check the o-rings. Make sure they are pliable and not flat and hard. If you take them out and they crumble, they are bad and need replacing. Mine crumbled when I ended up carefully cutting them apart to remove them.

Clean everything up with some silicone oil, dry everything off, apply small amounts of silicone grease to the washers and o-rings, assemble and put back together.

I only thought of this after going over my chrono and seeing the shot spread was super wide so definitely get a chrono.
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i agree - the O-rings in the Avenger seems like they have been installed for years. When I installed a external plenum I depressurized the rifle and when i wanted to fill air in again it leaked from the pressure pipes. I took the pressure pipe off and saw the O-rings were much stiffer than the 90° shore they should be. The dealer that sold me the AVA had not invested in any repair / overhaul kits so no help from him. He asked me to measure the Oring - and send him the dimensions - then he would order that O-ring at Krale. I ended up buying a O-ring kit from UK with expensive freight Import tax, Administration Fee, and VAT. the most expensive O-rings I ever bought.

But you are right the origins were stiff like plastic - After changing the O-ring it was OK again I then shot it a couple of times - since it has been standing in my storage.
I could easily find the o-ring size locally in Denmark in 70°Shore but at 300 Bar - I am sure it is not for fun they are 90° shore original.

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I've never tried one of the conventional looking chronographs from China. Aliexpress calls the clamp on "shooting chronograph bullet speed tester" and the tripod "high sensitivity multifuntional for shooting speed meter ball velocity energy measurement shooting chronograph shooting speed". The clamp on is under $20 and the tripod under $25. Both are much smaller than a conventional chronograph with a black plastic base with four metal standoffs holding up the top part where the display is. The clamp on has a V shaped block on the base with a rod that curves up over it to clamp to the shroud or barrel.

I do not like searching aliexpress but if you did it with that exact language I think it would work. Or just google "cheap chinese chronograph" and at least the clamp on should show up.

Both the ones I like have rechargeable batteries that last a long time and they almost never miss a shot inside or outside. The work better than my last conventional chrony. The first ones I got only read mps but the last one I bought can be set to fps if you push a button during the startup.
 
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Update - in a way… so I took the stock of the gun and tightened every screw down. Nothing seemed off. BUT I was able to push the schroud/barrel itself from side to side, almost as if its not seated correctly in the “housing” But it seems to be, I am not able to push it in any further, and both setscrews are tight. Is this normal? I put the gun back together and tried to shoot some groups again. It grouped okay, but it was off to the right. So I pushed the barrel very gently to the left and voila - the gun suddenly shot to the left of the target. There is a small gap between the schroud and the housing. It almost looks as a shim or a gasket of some kind could remove the gap. This is not supposed to be this way, or is it? I have heard of free floating barrels, but not like this. Or?

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drpietrzak said:
I use an inexpensive chronograph as well. Mine works fine.

Have you tried adjusting the hammer spring? Others have reported that if the hammer spring tension and regulator pressures are not balanced things can bounce/jump. This causing inconsistent results. This can potentially vary by temperature and tank pressure.
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It is bone stock, Ill be waiting for a cheap chrono to arrive before I begin the tuning
 
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droyd said:
My first thought is the barrel isn't pushed in all the way but my barrel has a very small gap like yours. I think mine* might be smaller. Does the magazine click into place fine?

Is your barrel supported by a barrel band and if so, is that secured to the stock?
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Yes the barrelband is secured to the stock. And the magazine clicks in fine. Irs just weird that you are able to aim by pushing the barrels to one side by hand🤣🤤
 
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droyd said:
You'll need to show us what you're pushing on. There should be two things inside the shroud, some spacer more towards the middle of it and the baffle system at the very end of it.
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I can push/pull the barrel with the schroud on from side to side relative to the air cylinder. I dont use any force. Almost as if the barrel is not fitted 100p to the housing. The bafflestack and the center plastic thing in the middle of the schroud sit as they are supposed to.. so if I grab the cylinder with one hand and grab the barrel with the other, I am able to change the “direction” of the barrel
 
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