Made an edit.

At first it sounded like the Stalwart-class was a small, insignificant enough ship to be on.. too bad the only one ever named was UNSC In Amber Light.

The M319 is actually said stand-alone unless you mean the multi-shot version, although the attachment version is known as the M301 and didn't see much of any use outside Halo: Wars.

Besides, that added heft to the standard-barreled BR55 improves aim.