What I did with mine is stick a small shim - cut from a pop can - and wedged it between the block (that connects to the upper receiver) and the outter barrel (which inserts into this block secured by like 3 small screws). I found most of my wobble was due to the gap tollerances being very low. You have to experiment with the shim size (mine was approx. 1cm x 1cm or smaller) so that you have a nice snug fit.
I baught the TM RIS unit and after it was installed it was pretty solid. However I had to add a PEQ for the battery and then it became rediculously, and uncomfortably front heavy. A crane stock will balance the gun out very nicely.
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