Lock, Stock and Two Smoking Barrels (1998)

Four Jack-the-lads find themselves heavily - seriously heavily - in debt to an East End hard man and his enforcers after a crooked card game. Overhearing their neighbours in the next flat plotting to hold up a group of out-of-their-depth drug growers, our heroes decide to stitch up the robbers in turn. In a way the confusion really starts when a pair of antique double-barrelled shotguns go missing in a completely different scam.