"My neighbor came into my girl's house on Sunday night with a 12-gauge shotgun and shot me in the face as I stood up when I seen someone coming in,” the man, who performs under the name Lord Lhus, said on his Facebook page.
"Lucky for me the bullet missed me by inches," he said, adding that the flame from the bullet "burnt my right cheek".
The bearded man posted a photo (since removed) showing a burn mark on his cheek about the size of a two-franc coin.
The rapper described how he grabbed the gun and fought for his life.
"Thankfully I won that fight and the neighbour is now in jail."
He said the shooter wanted to murder his girlfriend and her four-year-old daughter for "making too much noise all the time".
Early on Thursday, the American posted a photo of what he said was a gunshot hole in the wall.
"I'm very happy that my brain fragments are not scattered all over this wall and it's just a shot from a shotgun in a concrete wall," he commented.
The incident occurred on Sunday at around 10.10pm.
Bern cantonal police on Monday confirmed that several shots were fired in the building and officers found several bullet holes.
“A melee ensued in the stairwell where a new shot was fired,” police said.
“A neighbour finally managed to remove the weapon from the hands of the shooter before he retired to his apartment.”
The “neighbour” apparently refers to the American expat.
Police said he was “slightly injured” but was indeed hit by a bullet.
The alleged perpetrator was also slightly injured in the scuffle.
Not knowing whether he had other weapons, police called for reinforcements and arrested the suspect in his apartment shortly after midnight.
The arrested man remains in custody.
Police continue to investigate the case.