The Sentinel Series offers a range of firearms from around 100 years ago, WWI, Prohibition, Great Depression, etc. Each gun model has a mix of accessories that are historically real, purely silly or both. Game or ready, though I expect you to modify them a bit to build yourself the perfect weapon for your perfect project. Reasonably low poly, as I am unpleased with how blocky the super low poly firearms tend to look.
The M1911 or Colt 1911 was invented in 1911 by John Moses Browning and is still used to this day. It defined the very concept of the modern handgun. Being such a long lived gun, there are a lot of modern mods out there, but for the Sentinel Series I wanted to stick to old-timey stuff. Mostly. As auto-loading pistols were invented before auto-loading rifles or SMGs, carbine conversions and full-auto conversions were common modifications to fill this gap in firepower.