The Tokyo Marui, Gen 4 “Glock” Gas Blow Back Pistol has had an official “advisory” notice issued today. Tweeting from their official Twitter account they said;

[Important Notice] We have received the following reports regarding the gas blowback “Glock 19 Gen.4”:

By hitting the magazine hard, an unintended firing operation is performed. We are in a hurry to confirm the situation, investigate the cause, and establish countermeasures, and we will inform you about the details of this matter in the near future.

As soon as the countermeasure method is decided, we will provide free support, but in the meantime, regarding your “Glock 19 Gen.4”, “Do not give too much momentum when inserting the magazine” Please be careful.

We sincerely apologize for the inconvenience caused to all purchasers.

(Translated using Twitter Translate)