Unfortunately most of them have lost their bayonets and require fixing.
I have in the past tried plastic card and this has been moderately successful. This time I used a plastic HaT figure to be my bayonet donor. The size and shape of the bayonet are almost the same as the HH bayonet and it most importantly it looks like a bayonet.
I cut the bayonet and the end tip of the musket of the plastic figure. I then cleaned upon the HH figure and filed a straight edge before scoring the ends the of the joint to make a rougher join.
I stuck the replacement to the figure using super glue and a little PVA glue. Once set I reinforced the joint area with a little Milliput. Once dry this can be gently sanded.
I have tested the join and it is solid. The flexibility of HaT plastic helps as it bends without putting pressure on the join. Hopefully I can get the paint to adhere and not flak.
And the final comparison photo showing my repaired next to a complete one. Once painted I think it be near impossible to tell the difference.