Without a Paddle: Nature's CallingWithout a Paddle: Nature's Calling - Internet Movie Firearms Database - Guns in Movies, TV and Video GamesWithout a Paddle: Nature's Calling
Mob enforcer Massey (Robert Blanche) carries a reverse two-tone SIG-Sauer P226 as his sidearm. This is the exact same custom P226 that was originally supplied by Independent Studio Services for 2 Fast 2 Furious (the unique nickel frame/blued slide combination is not available from the factory).
When confronting the campers at the tree house, Overton (Todd Robinson) takes a Colt Law Enforcement Model 6920 Carbine fitted with an ACOG sight from his backpack (definitely not an M4A1, as the barrel is clearly 16" and he only fires the weapon on semi-auto). The lower handguard on his AR is missing, so that he can quickly attach a Cobray 37mm Launcher to the barrel.
Cobray 37mm Launcher
After Massey tells him to "smoke 'em out", Overton (Todd Robinson) attaches a Cobray 37mm Launcher to his Colt Law Enforcement Carbine. As is common in movies, the Cobray 37mm launcher, which can only launch non-lethal ordnance in real life, is portrayed as an HE grenade launcher, standing in for the M203 grenade launcher. In this movie, the launcher is also shown capable of firing grappling hooks, too.