About 100 people are currently employed in Clydebridge, with a further 230 in Dalzell.
Lt Dalzell, from Hamstead Marshall, near Newbury, leaves parents Anthony and Colette, brother Angus and sister Olivia.
Ranger David Dalzell, 20, from Bangor in County Down, was killed on Friday in an "operational accident" in Helmand province.
There have been claims that Ranger Dalzell may have been accidentally shot by a colleague as they cleaned their rifles.
The family of Ranger Dalzell who was a Royal Irish Regiment (RIR) soldier said he was killed in a tragic accident.
Speaking after the inquest at Trowbridge Coroner's Court in Wiltshire, Ranger Dalzell's father, Gordon, said it had been a "tragic accident".
BBC: County Down soldier shot dead in 'accident' in Afghanistan
The funeral of David Dalzell, the 20-year-old Royal Irish Regiment soldier shot dead in Afghanistan two weeks ago, has taken place in Bangor.
He also gave the posthumous Elizabeth Cross award medals to the families of Lance Cpl Stephen McKee, Ranger David Dalzell and Ranger Aaron McCormick.
Ranger Dalzell, who was unresponsive, was attended to by medics and air-lifted to the field hospital at Camp Bastion where he was declared dead.
BBC: County Down soldier shot dead in 'accident' in Afghanistan
The shot was fired out of the open accommodation tent and hit Ranger Dalzell, who was not wearing any body armour, in the chest.
BBC: County Down soldier shot dead in 'accident' in Afghanistan
Ranger David Dalzell, 20, killed in February, whose cause of death has not yet been confirmed, and Lance Corporal Stephen McKee, 27, killed by an IED in March.
Ranger Barry described his friendship with Ranger Dalzell as "brilliant".
BBC: County Down soldier shot dead in 'accident' in Afghanistan
Ranger David Dalzell, 20, from Bangor was shot in February.
BBC: 1st Battalion, Royal Irish Regiment in homecoming march
Lt Col Toby Gray, commanding officer, 1st Battalion Coldstream Guards, said Lt Dalzell was "assured, confident, utterly professional and hugely popular with his men and held in the highest regard by his seniors".
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