The 79th used two kinds of weapons. From the start of the war until 1863, the unit carried .69 caliber 1842 Springfields ( above left). These are available from most of the larger sutlers. The 1842 Springfield is available in either smoothbore or rifled versions. Both are acceptable. The 1842 Springfield has metal springs to hold the barrel bands in place ( detail above right )
From around Vicksburg in 1863 on, the unit carried 1853 Enfields ( right), British manufactured weapons in .577 caliber. On the Enfield, the three barrel bands are secured by screws on the underside of the band.
A sling ( made of leather ) is optional, and a matter of personal preference.
A note about carrying an actual Civil War weapon ( called an “original” ).
Reenactor weapons can take a beating at events, and originals are simply too valuable to carry in the field. Buy a reproduction, you will be happier in the long run.