Fuad Awale, 25, of no fixed address, and Sharmake Abdulkadir, 22, were found guilty.
Abdulkadir's DNA was found on the surface of a Belgian automatic pistol, the jury heard.
Evidence was given that Mr Abdulkadir's DNA was found on the surface of a Belgian automatic pistol.
In a prison visit Mr Abdulkadir is alleged to have told his mother he too was there.
Mr Abdulkadir, of The Fleet, Springfield, has also denied possessing of a firearm with intent to endanger life.
BBC: Teenagers shot dead in Milton Keynes 'drug turf' dispute
Sharmake Abdulkadir, 22, told jurors he saw Fuad Awale, 25, kill the teenagers.
The Somali Ahmed Abdulkadir Warsame was the conduit between the groups and pushed al Shabaab to strike Western targets outside Somalia.
Awale, Abdulkadir and Mr Harun, of Fishermead Boulevard in Milton Keynes, are all of Somali origin, along with the two victims.
Abdulkadir blamed Awale during the trial, saying his co-defendant killed the teenagers - and threatened to kill him if he said anything.
Abdulkadir, of The Fleet, Springfield, Milton Keynes, was also found guilty of possessing of a firearm with intent to commit an indictable offence.
The prosecution said a witness would say that Mr Ismail had been handing out free cannabis from a stash owned by Mr Abdulkadir.
Yahya Harun, 21, and Sharmake Abdulkadir, 21, both of Milton Keynes and Fuad Awale, 24, of no fixed address, deny a charge of murder.
BBC: Teenagers shot dead in Milton Keynes 'drug turf' dispute
Mr Awale has told the court Mr Abdulkadir and the other defendant Mr Harun are both drug dealers with separate areas in Milton Keynes.
Mr Awale, of no fixed address, Mr Abdulkadir, of The Fleet, Springfield, Milton Keynes, each face two counts of murder carried out with two other unknown people.
He said that Mr Harun sold cannabis and crack cocaine in Fishermead and Springfield while Mr Abdulkadir sold cannabis, heroin and crack cocaine in Springfield, Conniburrow and Fishermead.
He said Abdulkadir and Awale had travelled to the Netherlands to collect a gun, and all three defendants were recorded on CCTV near the location of the shootings.
He said Mr Abdulkadir and Mr Awale had travelled to Holland to collect a gun, and all three defendants were recorded on CCTV near the location of the shooting.
Abdulkadir Diad Mohamed, 33 -- a Somali national -- and the driver of the vehicle in which he was traveling were killed as they tried to escape, the statement said.
"An x-ray we did in Angola showed he suffered a fracture on his right leg and will be out of action for six weeks, " said Nigeria team doctor Mu'azu Abdulkadir.
The African contingent is expected to be bolstered to 7, 900, including 2, 200 troops promised by Chad, AP news agency quotes a Nigerian military official, Col Shehu Usman Abdulkadir, as saying.
Mr Abdulkadir - who also denies a charge of possessing of a firearm with intent to commit an indictable offence - said Mr Awale promised to kill him if he said anything.
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