The LVOA-C and LVOA-S are licensed replicas of the real LVOA-C and LVOA-S rifles made by War Sport Industries (now ZRO Delta). LVOA stands for Low Visibility Operation Application.
The LVOA-C is the Carbine variant and features a 14.5" barrel with 16" handguard.
The LVOA-S is the short barrel rifle variant and has a shorter barrel than the LVOA-C. It features a 12.4" barrel with 14" handguard.