Back to the Future
Back to the Future is the 1985 science fiction adventure directed by Robert Zemeckis and stars Michael J. Fox as Marty McFly, a teenager living in 1985 who is transported back in time to the year 1955, where he unexpectedly meets his parents during their teen years. Two sequels were released in 1989 and 1990 back to back.
The following weapons were used in the film Back to the Future:
Dr. Emmett 'Doc' Brown (Christopher Lloyd) is shot with an AKM by Libyan terrorists. This is one of the very few instances in film where a Kalashnikov-pattern rifle is seen jamming (yet it can happen, usually when a round pops up at a strange angle in the magazine, stopping the feed completely, and racking the action doesn't immediately eject the misfed round). Why this was noteworthy amongst firearms enthusiasts is because the AK series is considered some of the world's most reliable weapons and rarely experiences jams such as the one portrayed in the film. Judging by the time period, the firearm seen here is probably an Egyptian Maadi ARM converted to full auto.
The Libyan terrorists attempt to destroy the time machine with an RPG-7, causing Marty McFly (Michael J. Fox) to accelerate to the speed necessary to initiate time travel in an attempt to escape. In reality, the weapon is a fake RPG-7 common in films made in the 1980's such as Red Dawn.
Colt Single Action Army
In the beginning of the movie, Doc Brown attempts to defend himself from the terrorists with a nickel-plated Single Action Army fitted with pearl grips. He is also seen to be in possession of an SAA in 1955 as evidenced in Back to the Future Part III.
Charles Parker 1878 Double Barrel Shotgun
When Marty first travels back in time to 1955, "Old Man Peabody", a farmer plus obsessive pine-tree breeder (Will Hare), mistaking him for a malevolent space mutant, fires a Charles Parker shotgun at him.