Pistols are Lara Croft's trademark weapons, appearing with her in every game. They almost always have unlimited ammo, with the exception of Angel of Darkness and Tomb Raider 2013. There are many different types of pistols used throughout the various games.
The first 5 games feature a pair of semi-automatic 9mm pistols, likely based off the Browning Hi-power. As with all weapons on these first games, they have unlimited magazine capacity.
Angel of Darkness features many different models of pistol: the Vector R-35 (Heckler & Koch USP Match .45); M-V9 (Colt 1911 chambered in 9mm); Scorpion-X (Glock 17); Desert Ranger (IMI Desert Eagle Mark VII) and Rigg 09 (Ruger P08). There is also Kurtis's Boran X, which appears to be a customized Browning HP pistol.
On Tomb Raider 2013, Lara again uses several pistols, although only one of these will be in her inventory at the time: The Semi-automatic pistol (Beretta 92F, upgraded to an M93R when the "burst fire" mod is added); Tactical pistol (Remington R1911) and Magnum Pistol (Desert Eagle mark XIX).