Lara Crofts Pistols differ from game to game.
In the original series the model of the guns were apparently modelled after a Browning Hi-Power, although the inventory model is >apparently< a Colt M1911.
In Angel of darkness Lara apparently has quite a few different models for her dual pistols, 6 in total. Those models are as following:
HK USP Match .45 ; Colt 1911 using 9mm ammo ; Glock 17 ; Desert Eagle Mark VII ; Luger P08 and a customized Browning High Power. Not all of those models were included into the game though, if I’m reading correctly.
The Legend Timeline has several other Handguns as well:
2 Colt 1911 which chamber .357 (Tomb Raider Anniversary)
2 HK USP Match Pistols, chamber 9mm (Tomb Raider: Legend)
2 customized HK USP Match pistols, chamber 9mm with Desert Eagle style safety and a Beretta ejection port (Tomb Raider: Underworld)
The Survivor Timeline has different pistols as well, who would have thought…
A Beretta 92SB, chamber 9mm (Tomb Raider 2013)
A Remington 1911 R1 Enhanced, chamber .45 acp (Tomb Raider 2013)
A Desert Eagle Mark XIX, chambered .50 AE (Tomb Raider 2013)
Rise of the Tomb Raider also features 4 pistols and a revolver, can’t find the type of pistols though - just that there are 3 Semi-Automatic pistols and a heavy pistol…
huff.
That said, She seems to prefer HK USP Match Pistols and Colt 1911. We do have Both a .45 and a 9mm USP ingame, so one could use those, if they really plan to make a preset.