The Model No.4 Mk.1 Carbine is a bolt-action, repeating rifle found in ZombiU. It uses carbine ammo. You can find this weapon near Buckingham Palace. It can be found during Mission #4, near Buckingham Palace on the table inside the C&C building on Green Park Command and Control.
The Model No.4 Mk.1 Carbine is also commonly know as the Lee Enfield No.4 Mk.1 and was made in the early 40's and was used by riflemen from all the Common wealth countries and today is common with hunters. Most Lee Enfield No.4 Mk.1's fire a .303 Mk.VII SAA Ball, however the version in-game most likely fires 7.62x51mm NATO round. The reason for firing the NATO round is that the British government updated Lee Enfield No.4's so they could be used as a reserve weapon, the updated No.4 Mk.1 is designated L8A4.
In ZombiU, the Mk.1 is a versatile weapon that's highly efficient at short to medium range. It has a low rate of fire, as the character must cycle the bolt after each shot. As such, it is crucial that the player make every shot count, as zombies will be able to quickly close in between shots.The shots are fairly powerful: standard zombies will be instantly decapitated with a headshot, although Enraged require two headshots. It also has high stopping power, as body shots will send enemies stumbling back as though they'd been hit with a melee. This can make it a good choice for areas where the player is likely to be surprised, as it can quickly deal with small groups of most enemy types more efficiently than pistols and with more options than shotguns. It's particularly useful for dispatching exploding hunters, although its low rate of fire makes it a poor choice against Armoured guards and Evolved.