Question: what is the difference between the m17 and m18
[{'answer': 'M18 ( compact )', 'provenance': [{'wikipedia_id': '46285175', 'title': 'SIG Sauer P320', 'start_paragraph_id': 20, 'start_character': 191, 'end_paragraph_id': 20, 'end_character': 207, 'bleu_score': 1.0, 'section': 'Section::::Design details.:M17 and M18.\n'}]}, {'answer': 'M17 ( full size )', 'provenance': [{'wikipedia_id': '46285175', 'title': 'SIG Sauer P320', 'start_paragraph_id': 20, 'start_character': 171, 'end_paragraph_id': 20, 'end_character': 190, 'bleu_score': 1.0, 'section': 'Section::::Design details.:M17 and M18.\n'}]}, {'provenance': [{'wikipedia_id': '46285175', 'title': 'SIG Sauer P320', 'start_paragraph_id': 20, 'start_character': 0, 'end_paragraph_id': 20, 'end_character': 542, 'bleu_score': 0.9096785415642911, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4663262136905618665}, 'section': 'Section::::Design details.:M17 and M18.\n'}]}]