Yes. The M1C and D have a cone flash hider to protect the shooter's eyes, a left side mounted scope (parallax can be an issue) and a leather cheek rest. The guns have the scope mount, and were accurized. They are closer to what we would call a designated marksman's rifle than an actual sniper rifle.
Yes, it attaches to the muzzle and lug.
Recent work:
FREEHOLD: RESISTANCE, Nov 2019 - Baen Books
BATTLE LUNA (contributor), Jul 2020 - Baen Books
FREEHOLD: DEFIANCE, Jun 2021 - Baen Books