Like the BOSG.12.2, the TCSG12 fires single slugs that have a long range and are capable of headshots. Its lower damage is made up by the larger magazine size and attachment options, making this gun comparable to a DMR in practical usage. Typical of shotguns, the TCSG12 has high vertical recoil, but the random spread is minimal.
The TCSG12 features high damage potential, being able to destroy unreinforced hatches in a few shots; the actual damage potential depends on the number of hatch "beams" the slug goes through, so a flat angle minimizes the number of shots needed. Unlike the BOSG, it can destroy wooden "beams" in double-layered walls if properly aimed.