a little less than 2in long
if i put the ignitor on the end like you did it would be about 3in long which is smaller than stornes gun

here are the pics
first one before i attached the ignitor

next here it is after i attached the ignitor compared to a knife

here is me about to shoot it

next to a tape measure(a little bigger than said above)

so sthorne go change your sig 8)
i now have the title of smallest combustion on spudfiles(again) :wav: