A former Royal Marines instructor is on trial in Exeter accused of assaulting a young recruit by placing a loaded handgun in his mouth. Brian Bannister, who was 17 at the time, claims the incident has caused him to suffer with post traumatic stress disorder. The instructor says the incident never happened. The alleged assault is said to have taken place at the Commando Training Centre at Lympstone in the summer of 1991, but only came to light when Royal Marine Brian Bannister was involved in a car crash in 1998 and was diagnosed with Post Traumatic Stress Disorder. He says he's plagued every day with flashbacks to his basic training when a weapons instructor, Corporal David Everall lost his temper and pointed a pistol - which the recruit believed to be loaded - in the 17 year old's face, and told him to put the end of the barrel in his mouth. Corporal Everall's finger is said to have been on the trigger. "I was scared" Bannister said, "I thought, what's he doing? We had always been told by the Corporals never to point a weapon at anyone unless you were intending to kill them". "He stuck the gun in my face, and stood there grinning, I was in tears" "I was crying my eyes out, I was pleading, it was like he was enjoying it. I can't get that look out of my mind," He told the court yesterday. Brian Bannister continued in the Royal Marines, including two tours in Bosnia, for seven years until his car crash. Only then did the alleged incident at Lympstone return to haunt him, he testified that before the road accident he had forgotten all about it, but now he lives with the memories every day. Another former recruit, Julian Maxwell testified that he had seen Bannister on his knees with the instructor holding the pistol in the recruit's mouth, but he didn't know if the weapon was loaded. The defence in this case claims the incident never happened, and that Brian Bannister's post traumatic stress disorder was caused by the road accident. David Everall who also has since left the Royal Marines denies causing actual bodily harm and affray. The trial continues today.