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A Firing line set including loading poses for Napoleonic Line Infantry seems to me to be a logical addition to the Strelets range.
So far we have had sets covering on the March (Battle Formation) March 2 (Casual March), Attack, Standing at Ease, Standing Order Arms and Standing Shoulder Arms, I would put a Firing line in order of preference only behind the March (Battle Formation) set.
The kneeling poses I would reserve for light infantry sets only.