you will need to aim the BB's feed path upwards when the rocket lands. otherwise the BB's will shoot out straight and drop a foot or two from the rocket.
another reason I say that it will only shoot a few feet is because you'll need to keep the weight down for safety, thus having less mass to create enough pressure to fire all those BB's far enough to be effective. overall lighter weight might also make the front 'air filled bag' ineffective because to light will cause it to not land nose first all the time.
adding a gas source on board the rocket to propel the BB's on impact will greatly increase mass making it unsafe. finding or building a small gas reservoir that is light enough might work but then again, the effective range will be limited.
it's an interesting idea but won't fly. please take my comments as constructive as I'd love to have a true 40mm that 'explodes' on impact or even in flight.
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