The Mk VII 'Lucius' pattern Railrifle with ammunition clip.
The Railrifle is a weapon commonly used by Snipers and Marksmen in the Lenehenese Imperial Guard. Using linear accelerators to launch a hypervelocity, Titanium-tipped solid dart, the Rail Rifle is capable of wounding even famed Varangian Guard. While loaded with a dozen rounds, the energy requirements for firing even a single slug requires massive amounts of energy, which creates a slow rate of fire as the weapon would overheat and break if fired too often.
Despite it's impressive stopping power and high penetration, it is not popular with the rank and file of the Imperial Guard, who see its delicate electronics and potential to overheat as a liability on the battlefield, and many prefer the more reliable Designated Marksman Rifle.