I've been looking for something like this. Which extension did you find works? Is the fitment fairly firm?
It would appear there's only two lug extension on the market and both are available in the USA and designed for AR15's..APG Defence and Triple-R. I went with APG. This product does require some grinding to properly fit the Type 81.
When locked in place the unit is very sturdy with no movement on the back end. The only movement is from play between the ring and the barrel. Ideally a notch would be machined out of the barrel ring as apposed to grinding off the bayonet ring tab.
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