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The KJW M700 do the same thing. Caused by a change in velocity in every shot.
You must get the velocity to become stable. The bolt is adjustable on the KJ so I am guessing you can adjust it on the tanaka. Adjust it down to 400 fps ( guess) and hopfully it becomes more stable. Right now it is shooting max everytime. The gas in the mag changes every shoot so each max shoot is different.
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