After using his personal custom UT-1D Civilian Astray DSSD Custom to battle Serpent Tail, Earth Alliance, and the guerrillas in the Republic of East Asia. Leons Graves decides to upgrade his Civilian Astray DSSD Custom into the PMC-1L Arms Astray PMC Custom.
It first appeared in chapter 9, Xist piloting his CGUE Assault, Lukas piloting his Strike E IWSP, and Socius piloting his Hyperion G Unit 1 heads towards the ZAFT base for a cease fire and call for a truce.
On there way Leons in his Arms Astray PMC Custom confronts Lukas. Lukas fires at Leons, but Socius protects him because he was a Natural. Leons then battles Lukas and damages his Strike E IWSP.