The GX Pump PCP Compressor Resource
I'm a PCP airgun professional and Alkin dealer. The Alkin W31 is the best compressor on the market — I'll say that plainly. But the W31 starts at $5,609 and isn't portable enough for most airgun enthusiasts. For 99% of the people who call me about compressors, that price simply isn't justified.
So for those who need a capable, realistic-priced option, this site gives you my honest take on the GX Pump lineup — the best of the budget water-cooled units — along with the inline filters and filling tips you need to use them right.
Why I'm an affiliate site and not a reseller
I don't recommend Chinese compressors lightly — I'm an Alkin dealer and I know the difference. But I understand why people buy GX Pump units on Amazon: the pricing I can't match, shipping is free, and third-party warranty programs mean that when something breaks, buyers get a replacement shipped without fighting anyone. Customers have told me this directly. I can't compete with that model as a local dealer, so this site operates differently — I give you my professional knowledge and honest opinions, and Amazon handles the transaction.
What you'll find here
GX CS4-I Compressor
The one model I recommend without hesitation. Water-cooled, 5800 PSI, built for serious PCP shooters. I'll tell you exactly why this one beats the alternatives at its price point.
Read the full review →Inline Filters
Small Chinese compressors push moisture and oil into your airgun. This will destroy seals and valves. I cover the cigarette-style basics and the better vertical canister filters that give you real protection.
See the filter guide →Filling Tips
Filling a PCP airgun directly is different from filling a tank. I cover both — what fittings you need, how to fill safely, and the accessories from AirTanksPlus that make the job easier.
Filling guns →All GX Compressors
GX Pump makes more than the CS4-I. If you need a different pressure rating, power source, or budget, I'll walk you through the rest of the lineup so you can pick the right tool for your setup.
Browse all models →Sale Alerts
These compressors go on sale. Knowing when to buy can save you $100 or more. Sign up to get notified, or shoot me an email if you spot a deal — I'll share it with everyone.
Get sale alerts →About This Site
Who am I and why should you trust my take on PCP compressors? My background in airgun sales, service, and high-pressure fill systems — and why an affiliate site made more sense than trying to compete with Amazon.
My background →All Amazon links on this site use an affiliate tag. Clicking through and buying costs you nothing extra — Amazon pays me a small commission from their cut. It's how independent sites like this stay alive without charging you anything or pushing products I don't actually believe in.