One of the first guns seen in the film is the M1 Garand, seen carried by National Guard soldiers protecting African-American students during the integration of the University of Alabama. National Guardsmen are also seen with M1 rifles slung when guarding the rioters protesting the war in Vietnam.
M14
During the scenes when Forrest Gump (Tom Hanks) is training at Boot Camp, he and other recruits are seen assembling and disassembling M14 rifles. Forrest finishes his gun in record time.
M16/XM16E1
U.S. soldiers, including Forrest Gump (Tom Hanks), in Vietnam are seen armed with M16 rifles, which due to continuity error change from slab-side M16s to XM16E1 rifles, which feature forward assists. Both rifles feature three-prong flash-hiders, so it is difficult to tell them apart from the left side of the rifle.
Charleville 1766
When the ancestors of Lt. Dan (Gary Sinise) are seen dying in battle, the one who died during the American Revolutionary War is seen with a Charleville 1766 flintlock musket.
M1903 Springfield
During the flashbacks of Lt. Dan's (Gary Sinise) ancestors who died in battle, the one who died during World War I is seen holding an M1903 Springfield.
Winchester Model 70
A Winchester Model 70 is seen in a picture of Huey P. Newton during the "Black Panther Party".
Handguns
Colt M1911A1
While in Vietnam, Forrest Gump (Tom Hanks) is handed a Colt M1911A1 for "Tunnel Rat" duty, and later his commanding officer, Lt. Dan Taylor (Gary Sinise) is seen using one after he is wounded during the battle.
Charter Arms Undercover
A Charter Arms Undercover is seen being used in the news footage of Arthur Bremer's May 15, 1972 assassination attempt on Democratic candidate George Wallace, which left the candidate paralyzed from the waist down until his death in 1998.
Smith & Wesson Model 19 Snub Nose
A Smith & Wesson Model 19 Snub Nose is seen in the hands of then-Secret Service Agent Danny Spriggs during actual news footage of an attempted assassination on Ronald Reagan on March 30, 1981. In 1981, the standard issue sidearms for the USSS Presidential Protection detail was either the Smith & Wesson Model 19, usually a snub-nosed model, or the stainless variant, the Smith & Wesson Model 66-2. Agents on the President's detail carried these weapons with six hollow-point .357 Magnum rounds in the cylinders. Both weapons can be seen in news footage of the Reagan assassination attempt, as can an Uzi submachine gun.
Colt 1860 Army
When the ancestors of Lt. Dan (Gary Sinise) are seen dying in battle, the one who died during the Civil War has a Colt 1860 Army in his hip holster.
Colt Official Police
A nickel-plated Colt Official Police is seen wielded by a "Black Panther" during the "Black Panther Party".
Submachine Guns
M1928A1 Thompson
Another one of Lt. Dan's ancestors, who died during World War II, is seen holding an M1928A1 Thompson submachine gun with a 30-round magazine and lacking the Cutts compensator.
Shotguns
Remington 870
A "Black Panther" is seen holding a Remington 870 in a photograph pinned to the wall during the "Black Panther Party".