The KJW P226 gas magazine comes in a simple brown cardboard box. It has the KJW logo. The "KP-01M" model number is stamped to the side of the box (see photo below).
On the bottom of the magazine, you can see "KJWORKS" stamped into it. There is also the gas port for you to fee green gas or propane. To feed it, turn the magazine upside down, turn the gas canister upside down, and push the canister nose down into the port. Let the gas and liquid flow into the magazine for a few seconds. Then release the gas canister from the magazine.
Green Gas vs. Propane
Green gas is propane with silicone lubricant and no odorant. Propane has the odorant added so that you can smell it.
The KJW P226 magazine has a semi-gloss finish. It is smooth to the touch and quite heavy. The magazine is made fully out of metal. It is far heavier than a metal AEG magazine.
The top of the magazine is the standard BB feeding hole and the Gas Route Rubber Seal (see photo below). The gas release button is on the back, just slightly below the top.
Loading the gas magazine practically requires a speed loader. Otherwise you will have to load one BB at a time. But even with a speed loader, loading BB's is not an easy task. First, you have to hold the spring down with one finger while holding the magazine. Then, you'd have to hold the speed loader with your other hand while feeding BB's into the magazine. And you need to have a pistol magazine adapter for your speed loader, too. It is doable, as I have done it a few times already. But it is not as easy as loading an AEG mid-cap magazine.
The magazine can hold 26 rounds. The real Sig Sauer P226 has various magazine variants, holding 10, 12, 13, 15, 17, 18, or 20 rounds; depending on bullet type and magazine size. Therefore, you can use the WE F226 magazine to emulate any of the real firearm magazine by loading the same amount of rounds as the real magazine. Nice thing about the GBB magazine is that all BB rounds in the magazine will fire, unlike an AEG magazine where some rounds will be wasted.
There is no real easy way to unload the magazine like the unloading switch on an AEG magazine. Therefore, the easiest way to unload the magazine is to pop it into the P226 and fire off all the rounds.