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I had some early leaks and then an odd failure - at about 3500-3800 lbs while filling, the burst disk on the gun blew out - this seemed to create a cascade of failures - couldn’t even begin to build pressure with my little compressor and it clearly wasn’t a single point - that prompted the first...

You need a caliper to measure the o-rings or compare the old one with the new ones - In my gun there were a number of o-rings that were so deformed or stiff that they broke when trying to remove them - that makes using a caliper really helpful - even if its a cheap plastic one, you can measure...

I haven't found a source of this exact size -

that IS the problem - they are all black in the package but two different shore hardness values.... the harder shore 90 rings are all in the high pressure side of the gun

My gun now falls into the "one-off" category - so not completely repeatable. When it was stock, I was maxing out around 870 as well with 33-34 gr pellets and slugs were slower than pellets for the same weight. Increasing the shot pressure above 175 bar wasn't all that helpful (or consistent)...

Two different steps here - removing the barrel is super simple - there are two recessed set screws in the scope rail on top - loosen these two screws and the barrel is free to come out BUT - there is also a pin in the end to index the barrel - so it always goes back on in the same relationship...

My Avenge-X has been quite consistent - routinely put 8 rounds in a dime sized group at 50M My shooting skills are rookie+ but haven't had consistency problems with the gun. Shoots pellets and slugs quite well.

It was may "onramp" and the 25 cal has been a lot of fun. Works out of the box and with a little tuning shoots better than I expected - leave money for a decent scope - the Donny FL 30 cal Yokozuna moderator eliminates a lot of the noise but its not super loud to begin with (they recommend the...

Anyone have this compressor? I just purchased five "broken" units at a price worth taking the chance. The water cooling circuit uses a clear plastic piece in the water jacket around the one cylinder - all five units this ring appeared to have stress fractured - either from heat or the coolant...

I have the classic synthetic with the bottle in .25 Energy on target and 100M range, the 25 might have a bit of an advantage but... The gun seems to have just enough power for 25 but there are fewer pellet and slug choices than in .22 and the gun will max out on power with 25. Shooting for...

I reached a point where my process improved enough that I felt comfortable that, while still rookie class, I was seeing groups that were inconsistent and not completely "my fault" I decided to weigh some of my pellets and slugs to see if the variance should be significant at 50M. I was just...

I just sat and measured tins of 21 different pellets and slugs - While the JSB Exact King Heavy MK II flys really well with my gun, it had the third worst spread of weights from lest to heaviest - While stated as 33.95 gr, my tin ranged from 33.80-34.75 gr - A range of 0.95 gr The best...

This is a relatively inexpensive rifle - yes backup rings and tighter tolerances would be ideal but I'm not sure at what price point they become practical - I think that in this case a slightly larger cross section to take up the width of the groove may work - even if I need to make the groove...

The current o-ring is id 6mm cross section 2mm and Shore 90 - My first thoughts were contamination too - but I have replaced all of the o-rings, cleaned everything and am only using 100% silicone oil - but it still happens - I am going to try several materials -

I have been looking at the failures - and am thinking about alternate materials. A few locations show classic "extrusion" with the impression of the gap and edges showings micro tears and "chips" - a good indication of a fit or tolerance problem - and I'm gathering dimensions and info on those...

I have an Avenge-X 25 cal and have had numerous o-ring issues over time - There are two different schematics of the rifle that I know of - with variations for the stocks and tube or bottle air storage. The drawing available at Pyramid Air is the clearer one but doesn't list a few of the pieces...

As an experiment, I tried putting a cylinder of desiccant beads on the intake of my small compressor - these are the "purple beads" that turn pink as they absorb moisture - the housing is clear and it uses simple 1/4 NPT fittings and I just put it in line and filled with beads - the housing has...

This is all extremely helpful - And now I have an entirely new rabbit hole to dive into and try to understand. " The Effect of In-Bore Yaw on Lateral Throwoff and Aerodynamic Jump" I also "over complicated" my situation a little with some mods to the rifle - The barrel port is now oval and...

Troy - I've noticed that several pellets I have utilize a significant hollow on the back side of the pellet - the probe on the Avenge-X 25 cal is quite narrow pointed and does not push these pellets as far into the barrel - The JSB Exact King Heavy pellets have a fairly flat back and after...

I've replace these two o-rings twice already - along with many others - finding the same thing - o-rings are deformed and both hard and brittle. These are also an o-ring that the kit includes in two different durometers (70 & 90) - same size but different softness - if you gently squeeze the...