Joe Spencer died in November 2016 (Picture: Ministry of Defence).
A "series of errors, shortfalls and poor judgement" at an RAF weapons training exercise led to the death of Lance Corporal Joe Spencer, of 3rd Battalion The Rifles, a report has found.
The young soldier died at RAF Tain in the Scottish Highlands on 1 November 2016.
A report by the Defence Safety Authority published on Thursday said the 24-year-old from Hampshire died when his rifle discharged as he rested his chin on the weapon.
It concluded that his death was an "avoidable accident".
The report said: "Whilst resting his chin on the weapon's suppressor, equipment or clothing most probably snagged the rifle's trigger inadvertently, resulting in its discharge.
"That his weapon was in an unsafe condition with a round chambered was extremely likely to have been caused by an incomplete unload drill being carried out earlier that day."
The report added: "Whilst the initiative shown by the SNCOs (Senior Non-Commissioned Officers) in wanting to conduct an SOC (Sniper Operators' Course) is commendable, a series of errors, shortfalls and poor judgement conspired and ended in the death of a capable and highly-regarded JNCO (Junior Non-Commissioned Officer)."
It said poor supervision and a failure to follow mandated procedures were themes of the service inquiry report and added that the "post-accident response fell short in a number of areas".
LCpl Spencer's family said they were "disappointed" at the report's findings.
"We advised the service inquiry president that we were extremely disappointed with the content of the report and raised a number of questions," they said in a statement.
"We have received no response and are extremely upset to learn that this report has now been made public without any of our concerns being answered.
"However, it is clear to us the individuals responsible for delivering the sniper training course did not do so in accordance with the mandated course syllabus and requisite rules and regulations.
"We strongly believe Joe would still be with us today if they had complied."
The soldier's partner Cherycce Connelly said: "The report details far more failings than we could ever have anticipated and to say I am both angry and disappointed with its findings would be an understatement."
The 24-year-old, who lives in Dundee, added: "Joe deserved better. He was not on active deployment in a war zone.
"He was in training where risk to life should have been minimal. Joe should have come home."