One technique of joining plastic across cracks is to have a number of tiny threads of steel wire cable, like 5mm long. Lay them across the gap, and touch with a hot soldering iron till they "sink in". Do each thread a slight angle from the preceding one so they "key".
Easy to forget that the only order-of-magnitude (ten times faster) increase in firing rate was in going from muzzle loader to breech loader.
That said, fast follow-up shots really require that imperfect, inorganic magazine.
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