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Paul Taylor struck the kick to the right but Marine's debutant goalkeeper, Mike Stewart, leaped to push the ball away.
The only FC United yellow card of the evening was administered in stoppage time as debutant Simon Cardon badly mistimed a challenge.
On came substitute keeper 18-year-old debutant Alex Davies with the chance to make himself the hero by saving Reid 's spot kick.
Things might have been different had full debutant Jonathan Keaveny not scuffed his shot wide having rounded Marlon Beresford.
With Miedzinski passing 16-year-old Danish debutant Jonas Raun, the resultant 7-2 advantage saw Swindon haul themselves back into the match.