I put together my new Vudoo today, and was a bit dismayed to see that my rimfire suppressor did not tighten down all the way to the shoulder. This is not a new issue, on many rifles I use a spacer that came with the can, but the vudoo barrel threads are too short to put the spacer on, and too long to fully thread the can. Is this a known issue? Are the any known solutions, or is it acceptable just to tighten it down to the muzzle with a small gap?