Argon gas in a PCP air pistol ?

Anyone using Argon gas to charge their PCP air pistol ?
I just bought a Pardini K12 air pistol - I currently do not have a way to charge the cylinders.
I do have a TIG welder in my shop that uses pure Argon gas and I am already paying for a lease on an Argon cylinder. Argon is an "inert gas" so I'm thinking "maybe" ?
My current tank is getting low now so the gauge is currently only registering ~ 1000 psi but the gauge goes up to over 12,000 psi. I seem to remember a full (large) tank registering 4000 + psi ?
Anyone doing it ?
Don't want to buy / lease another tank if I don't have to !
TIA

I doubt it would do any damage, but I am not a chemist. You might need to adjust the regulator to get the same velocity. The only thing I can think of is it is a larger heavier atom so the seals should work better but the inertia is larger, though probably not noticeable.

I would think Argon is more expensive that air, but it's been a long time since I looked at welding equipment. I like my Hill hand pump. It doesn't take up much room and never needs refilling.

Argon is about 40% more dense, 1.7 vs 1.2 so you'll have more energy (due to mass) in the same release volume so I'd anticipate higher velocity as well... may also make she shot sound... deeper or lower tone due to the density difference. Think breathing helium in reverse.

Remember your pcp cylinders are 3000 psi

Just talk to your gas supplier and ask for a small bottle of 3000 psi Nitrogen.  Nitrogen is as close to air as any single gas can be.  The small bottle will last for a long time.  You might have to ”buy” it but then just exchange it when it gets low.  One fill on the pistol cylinder is good for about 100 shots.

Nitrogen is even better than air, as it has no oxygen to initiate corrosion (very low concern to start with)  However, the nitrogen tank will cost you about as much as a scuba tank to buy and certainly more to fill/exchange, even when you get into considering the inspections that need to be done on scuba tanks.  you'll also need to get a CGA to scuba adapter to make it work with your fill adapters.  the GCA fitting on the nitrogen tanks is a CGA 350, I believe (but could be mistaken).  I've build adapters to do stuff like this before... buy a pump or scuba tank... its easier and you'll be happier...

+1 on the scuba tank, pumps can introduce moisture, even with a trap and a drier.

Regards