Umarex Fusion 2 questions

[VSoldat]

I recently purchased an Umarex Fusion 2 air rifle. I've been having issues with what appears to be well known issue with this rifle... the bottom 12g CO2 cartridge not piercing. I've tried stacking 2-4 dimes between the cylinders, but even that's not helping. So I purchased 2-88g CO2 cylinders to eliminate that problem, provide a higher shot count and better consistency between shots. I understand the tube that the 12g cylinders go in has to be unscrewed, but how? It's so bloody tight and with it being close to the barrel, I can't really get a good grip on it. I certainly don't want to use any tools and risk damaging it. 

I've been doing some backyard plinking with Crossman 7,6g pellets, but certain I can get better accuracy with a higher quality pellet. What brand/weight pellet seems to perform best for this rifle?

Thanks!

 

[djna]

Maybe try a strap wrench to get the tube off. 

 

[pdxFrank]

 

[VSoldat]

I'll give that a try... Cheers! I presume the 88g cylinder just screws in once the 12g tube is removed?

Now, regarding the ammo that this rifle seems to perform best with. Any suggestions, anyone?

Thanks!

 

[Odoyle]

Aren't those guns supposed to pierce the Co2 when you shoot the first shot? 

 

[VSoldat]

No, they don't. I turns out that I needed to read the instruction manual and watch a YouTube video:

https://youtu.be/oLFo9aq0iC8?t=154.

However, it makes no odds at this point because that I'm now running Umarex 88g CO2 cylinders. I've noticed a marked increase in accuracy and the pellets seem to hit a lot harder, destroying such innocent things like empty beer cans at about 9.5 to 10m:

 

I'll get some grouping shot photos uploaded in the next day or two. All in all, I'm quite pleased with this rifle as my first air rifle purchase. No buyer's remorse here!

 

[VSoldat]

Didn't have a strap wrench, but improvised using a slightly damp rag to give me some extra grip. 

 

[jrod001]

How long can you store the gun with an.88 gram cartridge in it 

it want to sight mine in (just got it) but don’t want to waist the whole cylinder if you can’t store it with it installed . I do have the .12 grams ordered 

 

[KHoop]

I had the problem of the bottom CO2 12gr cart not getting pierced so I bought some 88gr CO2. It wouldn't pierce either so I sent the gun off to Umarex for repair. $58 to ship. Got the gun back and the bottom CO2 cart gets pierced now but the 88gr still doesn't get pierced. Wrote to Umarex regarding their repair and never heard a word back from them. I'll be dam$#@ if I'll spend another $58 to ship it back for a repair they didn't complete. That puts it at more for shipping than the gun cost me. Can't find the part to replace it myself so I'll have to stick with the 12gr stack. I own 3 Umarex guns. This one, an SA10, and the P08 blowback. Both the Fusion 2 and the P08 had issues out of the box that required me to ship them off at my expense to have them repaired.
I don't think I'll be buying any more Umarex products. I can't afford their warrantee.