Rifling
Rifling denotes spiral grooves in a gun’s bore that spin the projectile in flight and impart accuracy.
Rifling is present in all true rifles, in most handguns, and in some shotgun barrels.National Rifle Association of America’s Institute for Legislative Action (NRA-ILA) Glossary, http://www.nraila.org/glossary.aspx?s=Glossary&st=&ps=.
Last updated on: 01 February 2014