is that an Arquebuse? o.o and ol history uniform?

The uniform is that of a Union soldier of the War of the Rebellion (civil war) 1861-1865. The weapon is a rifled musket in .58 calibre.

Springfield Musket with Percussion lock, very nice.

The uniform is from what time, the 1870s?

All of it is WotR kit, in pattern, dating from the late 1850s, though the trousers are wartime expediant light blue rather than indigo. The Springfield is the 1861 pattern. The historical unit, 7th Reg. Wisconsin Vol. Infantry, would have had mostly 1854 Lorenz two-band rifled muskets in either original .54 cal. or re-bored .58 cal. along with scrounged or replacement Springfields as the war went on.

You look good enough to shoot!

Sarge and in charge.

You silly Tall hatter!! I faced your kin at Ft McCoy in a weird twist of a re-enactment. WW2 troops locking horns with a Wisconsin Artillery unit!