Ballistic evidence indicates that the 10-member gang took at least six guns with them on the attack. An independent panel of inquiry commissioned by the Pat Finucane Centre has established that among the weapons actually used in the killings were two Sterling 9 mm submachine guns and a 9 mm Luger pistol serial no. U 4. The submachine guns, which had been stolen years earlier from a former member of the B Specials, were linked to prior and later sectarian killings, whereas the Luger had been used to kill leading IRA member, John Francis Green, the previous January. In a letter to the "Independent Commission of Inquiry into the Bombing of Kay's Tavern" dated 22 February 2004, the Northern Ireland Office stated that: "The PSNI have confirmed that a 9 mm Luger pistol was ballistically traced both to the murder of John Francis Green and to the Miami Showband murders." In May 1976, Robin Jackson's fingerprints were discovered on the metal barrel of a home-made silencer constructed for a Luger. Both the silencer and pistol – which was later established to have been the same one used in the Miami Showband killings – were found by the security forces at the home of Edward Sinclair. Jackson was charged with possession of the silencer but not convicted, the trial judge having reportedly said: "At the end of the day I find that the accused somehow touched the silencer, but the Crown evidence has left me completely in the dark as to whether he did that wittingly or unwittingly, willingly or unwillingly". The Luger was destroyed by the RUC on 28 August 1978.