Sure you can fit a Convoy clip to a BLF A6 ,Unfortunatly the holes on the clip are a bit wider than needed, can’t remember precisely how I did it , think I drilled the holes in the tail cap out a little and finshed it off with a needle file to get them just right. (tip, remove the switch and rubber cover when doing this or you will most likely damage them )

The clip sits nicely and I like it far far better than the original , Standard length clip also fits 18350 tube but is too long really and could scratch when removing head to change battery.

I cut one down and reformed the end to fit the 18350 one , see pictures……!