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Latest I read from JB is that the factory is recommending NOT filling the gauge with glycerin

"small fluid holding container is connected to the the coolant hoses" That is a nifty mod. 

I checked today and got things clarified. The base Carette without PMV and autodrain is $1399 + shipping. However, IF AND ONLY IF YOU MENTION THE FORUMS while ordering, they will include the PMV and autodrain for $1399 + shipping. Being a forum member really helps out. Also, the current...

Be sure to mention you learned about the Carette on the forums.

That huge a FPS variation is unlikely to be barrel fouling or an incredibly inconsistent pellets. Hammer spring binding is the number one suspect here. I would examine the hammer spring and how it is moving. Be sure the hammer spring isn't bent. Also, depending on whether it is an older one...

The parallax wheel has backlash. That is why you get differing results depending on dialing it far to near vs near to far. To get consistent results, you need to take up the backlash in the same direction. 

One problem.... The fill whip's thermoplastic allows eventual seepage of humidity from room air into the system. The SCUBA guys said that might be an issue. After a week of storage, there is change in both 20 and 40% segments. Looks like I need to add at least another valve to isolate the...

See what happens if you tighten up your cheek weld more than you use on the Marauder. The bull pups have a different relationship between your shoulder and cheek contact. The butt is probably riding a little higher on your shoulder and this can make the bullpup seem to pop the rear of the gun up...

I'm wondering how heavy a pellet you are shooting. When I plot your shot curve, it has an overall downslope across the regulated segment. Then it goes off regulator about 150 bar and goes down without any rise. Your hammer tension is above the balance point for regulator pressure, but velocity...

If you decide to go with a drying filter that has direct contact between the aluminum housing and molecular sieve media, be aware of the reason for concern and follow a plan for mitigating risk. Atmospheric CO2 gets concentrated in the molecular sieve and is converted to its acidic forms in the...

Nitrogen

If you didn't already know, there is a 6000 PSI visual moisture indicator that can let all compressor owners actually know their compressor and filters are removing enough moisture. It runs about $100 including shipping from August industries. Just go to their site and search for "visual...

A good compressor setup with high side drying filter is going to run you just under $2000. Add a tank with fill setup and you're somewhere in the $2500 to $2700 range. Do it right and you will do it only ONCE. From there on, it's a dramatically different relationship you will have with your PCP...

Wife has already put up with me spending way too many hours being a compressor mechanic. No way she'd ever let me buy one just for testing. It would be interesting, but a good evaluation and report costs me more in time and expendables than a couple compressors.

Yes, ideally you would perform grouping tests at the range you engage targets. Provided, as you mention, it is a windless day and sight conditions are clear of thermal mirage. Think of my little exercise as an illustration of the process. Actually, what does amaze me every time I check the...

It has been a while since I rechecked my Vulcan’s shooting characteristics. Mine is a 22 that I usually keep at 900 FPS. Its regulator was set to 135 bar using a regulator tester made by John Hagan. I have been very happy with it, but it’s always fun to squeeze out a little more from our toys...

Someone needs to do a tear down and reveal what was actually improved from its base, two cylinder family. Would be most informative if after 24 hours of run time under load.

You're welcome. Actually graph out your shot strings. Don't be lazy and list a table with numbers. The SHAPE of the graph along with knowing your cylinder pressure at various points of the graph will teach you a lot about the gun.

I recommend a moisture filter on the output. The mechanical separator (condenser that you bleed) can only bring the high pressure compressed air down the 100% RH. Even worse, that is 100% RH at the elevated temperature coming out of the compressor. Your tank is cooler and that 100% RH is going...

If you are seriously embarking on tuning your airgun for best precision, optimum velocity, regulation pressure, and hammer tension, graph your shot strings out as fps vs shot number AND also keep track of what your cylinder pressure is every 3-4 shots. You’ll want that pressure data later to...