I can not answer the flash hider question for sure since I am not familar with that particular clone. However if it uses a real HK barrel it is most likely threaded.
As far as the bayonet you should just need a bayonet adaptor that fits in the end of the cocking tube and a bayonet. RTG has these and he is excellent to deal with.
http://www.robertrtg.com/g3.html
As far as the bayonet you should just need a bayonet adaptor that fits in the end of the cocking tube and a bayonet. RTG has these and he is excellent to deal with.
http://www.robertrtg.com/g3.html
