Without a Paddle
The following weapons were used in the film Without a Paddle:
Elwood (Ethan Suplee) trades his Mossberg 590 shotgun for the more traditional Mossberg 500 shotgun (which is seen again later in full, showing it has an extended magazine tube). Sheriff Briggs (Ray Baker) is also seen using the Mossberg 500 later, showing off its extended magazine tube, when he meets up with Elwood and Dennis at the end of the film. At first glance it appeared to be a Winchester 1300 shotgun, but a closer look at the location of the safety, as well as the magazine nut and the foregrip, shows it is a Mossberg 500.
Dennis (Abraham Benrubi) uses an L1A1 inch pattern rifle with a laser scope as his weapon of choice throughout the film. The inch pattern is evident by the front sight and the rear sight as well as details in the upper receiver and pattern of the foregrips. Rather than adapting the rifle for blanks (Hollywood style), an actual Australian Military Blank Firing Adaptor (used in training) is attached to the rifle. (Note: The British and Canadian BFAs look slightly different) This milspec blank adapter is usually painted bright red when used with military blanks, however, the filmmakers painted it black. This also means that they could only use military surplus 7.62x51mm blanks, and not the super hot Hollywood style blanks, as it would damage the blank adaptor.
M16A1 w/ Cobray CM203 37mm Flare Launcher
Elwood later uses an M16A1 rifle fitted with Cobray 37mm Launcher. Towards the end of the film, Dan (Seth Green) picks up Elwood's M16A1 but shows his lack of experience as it fires wildly. In several shots it appears that the bolt carrier has actually been removed from the rifle. This is a quick and easy method to render the rifle completely safe when in the hands of an untrained actor. In several unfiring scenes (and some quick cuts when the rifle has stopped firing) the viewer can see the rifle, sans bolt and bolt carrier. However, this is not commonly done because sharp eyed viewers will wonder where the bolt went.
Elwood uses a blued Beretta 92SB as his sidearm, as noted by the rounded trigger guard. The county police are seen with 92SBs in their holsters as well. (They are assumed 92SBs because why buy another gun if you don't even see it?)
Beretta 92SB Stainless
Dennis uses a Beretta 92SB with a stainless finish as his sidearm, also featuring a rounded trigger guard.
M60 machine gun
Unknown Double Barrel shotgun
Del Knox (Burt Reynolds) uses an unknown double barrel shotgun to force the boys to his house and keep them from running.
Colt Single Action Army
Del Knox (Burt Reynolds) keeps two Colt Single Action Armies in cross draw holsters. He uses them to blow up Dennis and Elwood's ATV, stopping the assault. He fans them from both the left and right hands, holding 5 shots in each, A well know safety precaution with old six shots. Load 5 bullets and drop the hammer on an empty chamber. They are only briefly seen and could be Uberti, Cimmarron, or Ruger Vaquero copies, or perhaps genuine Colts.
Elwood is seen briefly holstering a Browning Hi-Power but it is never seen again.
Fake Mk 2 Grenade (Cigarette Lighter)
In a very strange directorial decision, a pewter Mk 2 hand grenade cigarette Lighter is used by Elwood (but presented as a REAL grenade), who drops it when Dan knocks him and Dennis into the mine shaft. Jerry (Matthew Lillard) picks it up and manages to luckily take out the three bad guys when the grenade blows up a tree, falling on them just in time. Dummy MK II grenades are plentiful, so it is somewhat mysterious as to why they went out of their way to use a cigarette lighter novelty item.