More likely to have a chip on your clothing or shoes than in a gun that isn't H&K, Sig, ATI or Chiappa. Don't really see a place where Glock could stick an RFID. Fully broken down, I can't find anything out of place on mine. I'd be more worried about Surefire putting a chip in their light or something holding a static charge.
Regardless, if it worries you, get a cheap microwave and nuke it.
I fully understand why companies would want to use RFID's; it does make inventory much easier and faster. Frankly, these chips should be a simple external adhesive stick-on, or they should be stuck to the gun case. Would make more sense, and allow for larger gun stores to inventory that way. Once in the hands of the consumer, they may easily remove the chip if they wish to do so.
But any company that hides the chip, makes it integral to the firearm, or added in such a way as to make it difficult to remove or deactivate, can kiss my ass.
We've got enough crap with NObama talking up "smart guns" that we don't need another way for the government to track us or our possessions without our knowledge or consent. To anyone who finds an RFID in their personally-owned firearm, 86 that fucker.