I've handle a couple real AR's with similar LE style stocks and both were no more wobbly than airsoft versions, but it is true, VFC could have tightened the tolerances on it as to not have wobble. Then again it's not like it's a functional issue that interferes with the operation of the gun.
Now as per the 2 barrels, it does come with the extra inner and outer barrels to suit your prefered configuration provided you purchase the DX model.
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