I really got into pixel art by drawing little guns like this. These are some of my later works, though still a little old. Inspired by the pistols of Counter Strike, as much as I hate the game.
Top to bottom: Glock 18, H&K USP45 Tactical, H&K USP45 Tactical w/ suppressor, Sig P228, IMI/IWI Desert Eagle (blech), FN Five-Seven, dual Beretta M92 Elites
There was no tracing involved. The submachine guns can be seen here.