1. pulp fiction
2.the godfather part 1,2 and 3
3. Heat (in my opinion this film has the best gunfights in cinema history)
honourable mentions: apocalypse now,die hard, die hard 2, die hard 3, die hard 4, reservoir dogs, goodfellas,scarface,predator, aliens, training day, independance day, black hawk down, saving private ryan, platoon, the last boy scout, lethal weapon, lethal weapon 2, lethal weapon 3, lethal weapon 4