Barrel length has nothing to do with it, barrels only make a difference when your bb is able to fly directly down the center, there's no way to do it with an M203, so 1", 3", 6" barrel makes no difference.
Correct, the KA 60 and 96 rounders do shoot further than the 120 and 192 rounders.
Buy king arms shells, they're REALLY good and they offer replacement parts for when they do wear out (and they do wear out).
Store them with gas in them, same idea as a GBB mag.
The 40mm diameter is no accurate at all, as I recall they were 39mm, but you might as well just buy one from ehobby and measure it yourself. You don't need to be AV'd to buy from ehobby and it's not something they would likely stop at the border lol
The gas is held in a central chamber, the BBs on the outside wall. The gas is held it by a bearing locked valve. When you push up on the firing pin on the back, the bearings are unlocked and the valve gets pushes open by the gas pressure. The gas then escapes through the only place it can, where the BB's are.
After firing, you need to reseat the valve by pushing the firing pin in as far as you can, then reseating the firing pin. This assures the valve is in a sealed position and all the bearings are in the locked positions. You can then reload the shell with gas and BBs.
Anything else? lol
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