<page_title> M1 Abrams </page_title> <section_title> Specifications </section_title> <table> <cell> 120 mm M256 smoothbore <col_header> M1A1 </col_header> <col_header> M1A2 </col_header> <col_header> M1A2 SEP </col_header> <row_header> Main armament </row_header> </cell> </table>
The M1's main armament was 120 mm smoothbore.