I seem to have read about this a while ago, but can't seem to find the thread with the search.
Does the HK bayo fit on the JLD and can it use the HK adapter plug?
bayonet adaptor goes in end of cocking tube, then affix bayonet :)
I purchased a bayonet adapter from RobertRTG parts
for $18.00 .
Fits perfectly,it replaces the cockingtube end cover.
He also carrys bayonets if your looking.
There is also a less common version of the G3 bayonet that
does not require an adapter.
I thought this version was not tough enough for any real use,
so I put the adapter on my PTR.