Insert barrels, i.e. barrels for firing reduced calibre ammunition and being mounted within the normal barrels

Full Title

Barrels; Gun tubes; Muzzle attachments; Barrel mounting means (F41A25/00 takes precedence; barrel attachments for firing grenades or riot-control ammunition from smallarms F41C27/06) > Insert barrels, i.e. barrels for firing reduced calibre ammunition and being mounted within the normal barrels