Hallo timefuze,
it could have been used for such a purpose, but I doubt it. This would be too far an improvisation. This "Schlagrhre" gives off a sharp spit of flame, so also the recieving charge had to be ignitable. Also fixing this tube to anything would be a not easy improvisation.
I heard before that these were found on 20th century sites, but up till now nobody had any explanation for this. By the way, these "Feld-Schlagrhren" are to be placed in the 2. half of the 19th century, in the first half (Napoleonic times) a similar looking tube, without friction wire arrangement was used, that was ignited by a portfire or a slow match.
Bellifortis.