Benlynnx 4500Psi Aluminum Air Bottle, 30 Mpa Explosion-Proof Aeronautic PCP Cylinder, M18 * 1.5 Refillable High Pressure Tank for PCP Scuba Game(Empty Tank)

Great quality and exceptional value in customized airgun applications.

I purchased this cylinder/tank so I can refill my PCP air rifle in the field. This is a fairly small air tank, .5L, but it holds high pressure air without leaking. It's kinda heavy for a small air tank but it was inexpensive and it work for my needs. I would buy again if I needed a second tank.

For what it's worth, it's good. But heavy.

So far, holding pressure. Threads and O-ring cut are sized well. Appears to be well-made. The pressure rating stamping is a bit shallow and difficult to read (fairly visible under angled lighting), but I have no objections. I used the "Aopkeo Fill Station Adapter Valve 4500psi for Airsoft PCP Paintball HPA Cylinder Tank Bottle (M18*1.5)" from here on Amazon, and it fit well and sealed. Once I tightened down the Aopkeo's fill valve snugly, the whole works has held pressure rock steady at nearly 4,000 PSI for a couple of weeks. I've only had it up to just over 4,000 PSI (Aopkeo's pressure gauge reads just under 4,000, my pump says nearly 4,200), but that is about all I plan to fill it to. It's a metal tank - they did not appear to screw it up.

Put a cheap regulator on it and pumped it up with my compressor. Makes a good small portable tank for a few fills of my airgun. Current manufacture and pinstamped with certification and ratings. 30mpa working pressure and 45mpa test pressure just as the product details state. Cheap price, so I may have to buy a few more to use on modded bottle airguns.