S-1-K-6.6-D D/C .670 OAL S-1-K-6.6-D S1K520 S1K50000 S1K320 S-1-K-3.8-G D/C .670 OAL S-1-K-3.8-G S-1-K-3.8-D D/C .670 OAL S-1-K-3.8-D S-1-K-2-G D/C .670 OAL