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So what do you think of those Pakistani HK parts now?
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The same thing happened to me with a factory HK carrier back during the late '90's. WIth any manufactured part that is handled by humans, mistakes can be made. Not gun related, but I purchased driveshaft from the local Mercedes dealer that didn't have a CV joint on one end. It was just a mistake where QC didn't catch it, it got boxed and put into distribution. It's a $1500 part and the factory was in Austria, not a cheap labor market. The MB dealer just replaced it and sent it back to MB. It was inconvenient, but shit happens.
To the OP, whomever you bought it from should take care of it for you. POF's importer probably does some warranty stuff, but your first step is to contact whomever you purchased from and let them know what happened.