Question: With what weapon did did the subject of Summer of Sam perpetuate his murders?

Context articles: Murders of Chaney, Goodman, and Schwerner
Dwight D. Eisenhower Memorial
Europa trilogy
Object–verb–subject
Mel Gibson filmography
Bassett Road machine gun murders
Summer of Sam
David Berkowitz
Improvised weapon
Daughters of Hawaii

The murders of Chaney, Goodman, and Schwerner, also known as the Freedom Summer murders, the Mississippi civil rights workers' murders or the Mississippi Burning murders, involved three activists that were abducted and murdered in Neshoba County, Mississippi in June 1964 during the Civil Rights Movement.
 The victims were Andrew Goodman and Michael "Mickey" Schwerner from New York City, and James Chaney from Meridian, Mississippi.
 All three were associated with the Council of Federated Organizations (COFO) and its member organization the Congress of Racial Equality (CORE).
 They had been working with the Freedom Summer campaign by attempting to register African Americans in Mississippi to vote.
 This registration effort was a part of contesting over 70 years of laws and practices that supported a systematic policy of disenfranchisement of potential black voters by several southern states that began in 1890.
The Dwight D. Eisenhower Memorial is a planned United States presidential memorial to honor Dwight D. Eisenhower, the Supreme Commander of the Allied Forces in Europe during World War II and the 34th President of the United States.
 On October 25, 1999, the United States Congress created the Dwight D. Eisenhower Memorial Commission, and charged it with creating "...an appropriate permanent memorial to Dwight D. Eisenhower...to perpetuate his memory and his contributions to the United States."
 A preliminary design by architect Frank Gehry proved controversial.
 After several years of hearings and several design changes, a revised preliminary design won approval from the United States Commission of Fine Arts in the summer of 2013.
 After additional changes, another revised preliminary design was approved by the National Capital Planning Commission in October 2014.
 Final detailed design approvals were given in June and July 2015, but funding for the memorial remains in doubt despite the recent implementation of a private fundraising effort.
The "Europa" trilogy is a film trilogy written and directed by Lars von Trier, comprising his three feature films "The Element of Crime" (1984), "Epidemic" (1987) and "Europa" (1991).
 The films are not a narrative trilogy, but rather are linked by common themes and stylistic explorations.
 The overarching subject of the trilogy may be taken to be the social crises and traumas of Europe in the future.
 Each of the three films follows a character whose idealistic actions ultimately perpetuate the very problem he seeks to solve.
 Von Trier's later "USA - Land of Opportunities Trilogy" also deals with both apparent social collapse, and the ill-effects of the interventions of idealistic individuals.
 The trilogy also experiments with film noir conventions, and explores hypnosis and the relationship between reality and unreality.
In linguistic typology, object–verb–subject (OVS) or object–verb–agent (OVA) is a rare permutation of word order.
 OVS denotes the sequence object–verb–subject in unmarked expressions: "Oranges ate Sam", "Thorns have roses".
 While the passive voice in English may appear to be in the OVS order, this is not an accurate description.
 In an active voice sentence, for example "Sam ate the oranges," the grammatical subject, "Sam", is the 'agent', who is acting on the 'patient,' "the oranges," which are the object of the verb "ate".
 In the passive voice, "The oranges were eaten by Sam," the order is reversed so that patient is followed by verb, followed by agent.
 However, "the oranges" become the subject of the verb "were eaten" which is modified by the prepositional phrase "by Sam", which expresses the agent, maintaining the usual subject–verb–(object) order.
Mel Gibson, AO, is an American actor, director, producer and screenwriter who made his acting debut on the Australian television drama series "The Sullivans" (1976– 1983).
 While a student at the National Institute of Dramatic Art in Sydney, he was given an uncredited role in "I Never Promised You a Rose Garden" and subsequently appeared as a leading actor in the micro budget surf drama "Summer City" (both in 1977).
 Gibson rose to prominence during the Australian New Wave cinema movement in the early 1980s, having appeared in his breakthrough role in George Miller's dystopian action film "Mad Max" (1979), portraying the eponymous hero.
 He reprised the role in its sequels, "Mad Max 2" (1981) and "Mad Max Beyond Thunderdome" (1985).
 He appeared in Peter Weir's war drama "Gallipoli" (1981) and the romantic drama "The Year of Living Dangerously" (1982).
 Five years later he played Martin Riggs in the buddy cop action comedy "Lethal Weapon" alongside Danny Glovera role he later reprised in its sequels "Lethal Weapon 2" (1989), "Lethal Weapon 3" (1992), and "Lethal Weapon 4" (1998).
The Bassett Road machine gun murders were the murders of two men with a .45 calibre Reising submachine gun on 7 December 1963, at 115 Bassett Road, in the Auckland suburb of Remuera in New Zealand.
 The crime received considerable media attention and captured the public imagination for many years.
 Although the weapon was set to single and not rapid fire for the killings, word spread quickly of a "Chicago-style" gang murder previously unheard of in New Zealand.
Summer of Sam is a 1999 American crime thriller film about the 1977 Son of Sam serial murders and their effect on a group of fictional residents of an Italian-American neighborhood in The Bronx.
 Although the killer David Berkowitz, his murders, and the investigation are shown in the film, the main focus is on two young men from the neighborhood: Vinny (John Leguizamo), whose marriage is faltering due to his cheating, and Ritchie (Adrien Brody), Vinny's childhood friend who has embraced punk fashion and music.
 The murder investigation and other contemporary events, such as the New York City blackout of 1977 and the New York Yankees' winning season, provide a backdrop to the stories of Vinny, Ritchie, and their families and friends.
 The film was directed and co-produced by Spike Lee, who also co-wrote the film with Michael Imperioli and Victor Colicchio.
David Richard Berkowitz (born Richard David Falco; June 1, 1953), known also as the Son of Sam and the .44 Caliber Killer, is an American serial killer who pled guilty to eight separate shooting attacks that began in New York City during the summer of 1976.
 The crimes were perpetrated with a .44 caliber Bulldog revolver.
 He killed six people and wounded seven others by July 1977.
 As the number of victims increased, Berkowitz eluded the biggest police manhunt in the history of New York City while leaving letters that mocked the police and promised further crimes, which were highly publicized by the press.
 The killing spree terrorized New Yorkers and achieved worldwide notoriety.
An improvised weapon is an object that was not designed to be used as a weapon but can be put to that use.
 They are generally used for self-defence or where the person is otherwise unarmed.
 In some cases improvised weapons are commonly used by attackers in street fights, muggings, murders or during riots, usually when conventional weapons such as firearms are unavailable or inappropriate.
'The Daughters of Hawaiʻ i was founded in 1903 by seven women who were daughters of American Protestant missionaries.
 They were born in Hawaiʻ i, were citizens of the Kingdom of Hawaiʻ i before annexation, and foresaw the inevitable loss of much of the Hawaiian culture.
 They founded the organization "to perpetuate the memory and spirit of old Hawaiʻ i and of historic facts, and to preserve the nomenclature and correct pronunciation of the Hawaiian language."'
 They run the Huliheʻ e Palace and the Queen Emma Summer Palace.