S1AB M4G S1AB S1A-784114 S1-A-7001 S-1-A-6.6-G D/C .670 OAL S-1-A-6.6-G S-1-A-6.6-D D/C .670 OAL S-1-A-6.6-D S1A-505015 S1A-501210