ismecha define

code/modules/projectiles/projectile.dm

@@ -144,7 +144,7 @@
 			ignore_source_check = TRUE
 			return FALSE
 	if(firer && !ignore_source_check)
-		if(A == firer || (A == firer.loc && istype(A, /obj/mecha))) //cannot shoot yourself or your mech
+		if(A == firer || (A == firer.loc && ismecha(A))) //cannot shoot yourself or your mech
 			loc = A.loc
 			return FALSE
 

code/modules/projectiles/projectile/special.dm

@@ -45,7 +45,7 @@
 	..()
 	explosion(target, -1, 1, 3, 1, 0, flame_range = 4)
 
-	if(istype(target, /obj/mecha))
+	if(ismecha(target))
 		var/obj/mecha/M = target
 		M.take_damage(anti_armour_damage)
 	if(issilicon(target))