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The Tyr pistol inCall of Duty: Modern Warfare 3is a five-round revolver that packs quite a heavy punch. Even on its own without attachments, this deadly little gun is a one-shot kill in short to mid-range fights. All you need to do is connect your shot and you are golden.
On top of its heavy damage, the Tyr is surprisingly accurate. Taking advantage of that accuracy to help improve damage range in the Gunsmith can give you a one-shot kill at all ranges. Use the rest of your loadout to speed up the reload of the gun, and you will be ready to jump into a fight.

Tyr Build
With theimpressive accuracyof the base Tyr weapon, this loadout will take away some of that accuracy in favor ofadding additional damage range.
Having aone-shot kill at all rangesstrips away the need for an overly accurate weapon, and this build does just that.

Although a few aspects of this builddecrease the ADS speed, the default aim down speed of the Tyr is so high that youraiming will still feel quite snappy.
The combination of theZIU-16 Heavy Long Barreland the12.7x55mm High Grain Roundsgives the weapon enough power and range to be a one-shot kill even at longer ranges.

You will be running a pistol class with therange of an SMG, thespread of a pistol, and thepower of a shotgun.
Tyr Loadout Recommendations
Because the Tyr is a revolver, it has aslow reload speedby nature. You can work around this a bit with yourloadout choices.
Gear: Mag Holster
Havingdouble tactical equipmentwith the help of theEngineer Vestwill let you carrytwo Battle Rage canisters. When you are running around with a revolver, the extra boost will come in handy.
Speaking of a boost, equip theTactical Padsin your boots slot to give you moremobility in your sliding. Combine this with theDead Silencefield upgradeto make up for not concealing your footsteps.
Finally, grab theMag Holsterto directly impact yourreload speedand a second piece of gear of your choosing. TheTac MaskorEOD Paddingare both great options forreducing the effects of equipmentbeing thrown into the middle of the map while you are running along with your pistol.