Question: when was the glock 19 gen 4 released
[{'answer': 'July 2010', 'provenance': [{'wikipedia_id': '14664934', 'title': 'Glock', 'start_paragraph_id': 25, 'start_character': 65, 'end_paragraph_id': 25, 'end_character': 74, 'bleu_score': 1.0, 'section': 'Section::::History.:Product evolution.:Fourth-generation models.\n'}]}, {'provenance': [{'wikipedia_id': '14664934', 'title': 'Glock', 'start_paragraph_id': 25, 'start_character': 0, 'end_paragraph_id': 25, 'end_character': 329, 'bleu_score': 0.9632870032952191, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11927010650370303255}, 'section': 'Section::::History.:Product evolution.:Fourth-generation models.\n'}]}]