Carbine
The forearm of a carbine is not attached to the barrel. It is attached to an extension of the frame. So the barrel is essentially "free-floating", and holding on to the forearm has no effect on the movement of the action. Having said that, the barrel on ebay has the forearm attached to the barrel. If you look at the photo, there is probably a 3/8" gap between the rear of the forearm and the rear barrel flange. That is designed to allow the barrel/receiver assembly to move to the rear during firing. If you held on to the forearm while you are firing, obviously you would impede this rearward movement and the action probably would not function properly (Nah, it wouldn't function!) That is independent of whether the weight of the barrel/forearm assembly would be too heavy to cycle. So the forearm on the ebay barrel is just for looks, kind of like mammarys on a boar.
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