The Enforcer (1976)

The Following guns are seen in the 3rd "Dirty Harry" film:

Smith & Wesson Model 29

Harry Callahan(Clint Eastwood)'s primary weapon as usual is the Smith & Wesson Model 29. He comments in the film to Kate Moore that he uses it due to it's penetrating power.

S&W Model 29 - .44 magnum.

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Colt Diamondback

The 2" barrel version of Colt Diamondback (chambered in .38 Special) is carried by Harry's partner, Inspector Kate Moore (Tyne Daly), who keeps it in her purse.

Colt Diamondback Snub Nose Revolver - .38 Special

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Inspector Kate Moore

Colt Trooper

A Colt Trooper is seen carried by a uniformed SFPD officer.

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Smith & Wesson Model 19

Used by Frank DiGiorgio (John Mitchum).

Smith & Wesson Model 19 - .357 magnum

M16A1

The M16A1 is used by the SFPD Officers that arrest the Uhuru group, and later are seen among the weapons stolen from the US Army Depot used by Bobby Maxwell (DeVeren Bookwater) and his men when they abduct the Mayor (John Crawford) and hold him on Alcatraz.

M16A1 with 30 Round magazine - 5.56x45mm

M72A1 LAW

The M72A1 LAW is seen in the film, and are among the weapons taken from the depot by Maxwell and his men. During the final battle on Alcatraz, Maxwell drops his and is picked up by Harry, who uses it to destroy the tower that Maxwell makes his last stand in. When Harry fires the weapon, it looks more like a flare that was used to substitute for the rocket.