It sounds like your body retaining washer is mushroomed a bit. File the hole out in the center of the washer that separates the back and front half of the gun body.
The barrel could be a bit off center as well. Take the barrel o-rings off. Put a piece of electrical tape around the barrel over each of the barrel o-ring grooves. Put the barrel o-rings back on. Put the barrel on your gun and try it. The barrel will be held more in the center of the body and won't be pushed off to one side by the twist lock assembly.
The barrel could be a bit off center as well. Take the barrel o-rings off. Put a piece of electrical tape around the barrel over each of the barrel o-ring grooves. Put the barrel o-rings back on. Put the barrel on your gun and try it. The barrel will be held more in the center of the body and won't be pushed off to one side by the twist lock assembly.
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