A plastic slide will usually crack at the front end, just below the hole that the outer barrel protrudes through.
Depending on the strength of the molding, more catastrophic failures can occur, which can vary anywhere from your slide freeing itself from the prison of its rails and launching itself wherever your gun is aimed (got hit in the chest by a G23f plastic slide once), or at the worse end of the scale, your slide will completely shatter and parts/shrapnel will fly. Seen that happen as well.
Duster is hard to come by and expensive compared to propane. By making the switch to a metal slide, after about a year of use the savings from propane usage will basically pay for the upgrade.
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