A rifle with a bayonet.
The knife attached to a rifle (Not Riffle) is called a "Bayonet".
Bayonet.
Do you possibly mean a knife that is attached to the front of a rifle? If so, that is a bayonet.
A bayonet is the name of a knife attached to the barrel of a rifle.
To get sniper rifle you must have a commando which has a sniper rifle and a knife !!
Bayonet
knife, rifle
Bayonet
I am guessing some kind o pocket knife.....
Live Chive Knife Wife Dice Life Rifle
The knife at the end of a gun is called the bayonet.
If you mean a regular straight blade knife and not a pocket knife, the case is called a sheath.