Question: when was the forward assist added to the m16
[{'answer': '1967', 'provenance': [{'wikipedia_id': '19901', 'title': 'M16 rifle', 'start_paragraph_id': 28, 'start_character': 12, 'end_paragraph_id': 28, 'end_character': 16, 'bleu_score': 1.0, 'section': 'Section::::History.:Adoption.\n'}]}, {'provenance': [{'wikipedia_id': '19901', 'title': 'M16 rifle', 'start_paragraph_id': 91, 'start_character': 0, 'end_paragraph_id': 91, 'end_character': 201, 'bleu_score': 0.943604326170661, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12104645487880529640}, 'section': 'Section::::Variants.:XM16E1 and M16A1 (Colt Model 603).\n'}]}]