Most likely, yes you would be subject to a lawsuit of some degree…you would be using their intellectual property…however if you completely changed the look of them etc and made them completely yourself and they were not exact copies you have less of a chance of running into issues. The same thing applies to real world weapons and vehicles in video games, Colt, GM and several other large manufacturing companies have filed suits in the past for unauthorized likenesses of their products in video games. Fonts are another big item to watch out for.
Do a quick search and you should find several cases from the past…here’s a few I found in just a few seconds:
Use of the Tommy Gun: http://www.ibj.com/articles/7473-godfather-game-maker-sued-over-dillinger-tommy-gun
Here’s one over using the likeness of General Patton:
This one is for copying LeBron James’ tattoos: